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diff --git a/plip/test/test_metal_coordination.py b/plip/test/test_metal_coordination.py
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-# coding=utf-8
-"""
-Protein-Ligand Interaction Profiler - Analyze and visualize protein-ligand interactions in PDB files.
-test_metal_coordination.py - Unit Tests for Metal Coordination.
-"""
-
-
-import unittest
-from plip.structure.preparation import PDBComplex
-
-
-class MetalCoordinationTest(unittest.TestCase):
-    """Checks predictions against literature-validated interactions for metal coordination."""
-
-    ###############################################
-    # Literature-validated cases from publication #
-    ###############################################
-
-    def test_1rmd(self):
-        """Zinc binding sites in RAG1 dimerization domain (1rmd)
-        Reference: Harding. The architecture of metal coordination groups in proteins. (2004), Fig. 1a
-        """
-
-        tmpmol = PDBComplex()
-        tmpmol.load_pdb('./pdb/1rmd.pdb')
-        bsid = 'ZN:A:119'
-        for ligand in tmpmol.ligands:
-            if ':'.join([ligand.hetid, ligand.chain, str(ligand.position)]) == bsid:
-                tmpmol.characterize_complex(ligand)
-        s = tmpmol.interaction_sets[bsid]
-        # Coordination by three cysteines and one histidine of the protein
-        metalres = [mres.restype for mres in s.metal_complexes]
-        self.assertEqual(metalres.count('CYS'), 3)
-        self.assertEqual(metalres.count('HIS'), 1)
-        # Zn atom with tetrahedral geometry (coordination number 4)
-        self.assertEqual(s.metal_complexes[0].coordination_num, 4)
-        self.assertEqual(s.metal_complexes[0].geometry, 'tetrahedral')
-
-    def test_1rla(self):
-        """Rat liver arginase, a binuclear manganese metalloenzyme (1rmd)
-        Reference: Harding. The architecture of metal coordination groups in proteins. (2004), Fig. 1b
-        """
-
-        tmpmol = PDBComplex()
-        tmpmol.load_pdb('./pdb/1rla.pdb')
-        bsid = 'MN:A:500'
-        for ligand in tmpmol.ligands:
-            if ':'.join([ligand.hetid, ligand.chain, str(ligand.position)]) == bsid:
-                tmpmol.characterize_complex(ligand)
-        s = tmpmol.interaction_sets[bsid]
-        # Coordination by one histidine, three aspartic acid residues, and one water molecule
-        metalres = [mres.restype for mres in s.metal_complexes]
-        self.assertEqual(metalres.count('HIS'), 1)
-        self.assertEqual(metalres.count('ASP'), 3)
-        self.assertEqual(metalres.count('HOH'), 1)
-        # Mn atom with square pyramidal geometry (coordination number 5)
-        self.assertEqual(s.metal_complexes[0].coordination_num, 5)
-        self.assertEqual(s.metal_complexes[0].geometry, 'square.pyramidal')
-
-    def test_1het(self):
-        """Liver alcohol deshydrogenase (1het)
-        Reference: Harding. The architecture of metal coordination groups in proteins. (2004), Fig. 2
-        """
-
-        tmpmol = PDBComplex()
-        tmpmol.load_pdb('./pdb/1het.pdb')
-        bsid = 'ZN:A:401'
-        for ligand in tmpmol.ligands:
-            if ':'.join([ligand.hetid, ligand.chain, str(ligand.position)]) == bsid:
-                tmpmol.characterize_complex(ligand)
-        s = tmpmol.interaction_sets[bsid]
-        # Coordination by four cysteines
-        metalres = [mres.restype + str(mres.resnr) for mres in s.metal_complexes]
-        self.assertEqual(set(metalres), {'CYS97', 'CYS100', 'CYS103', 'CYS111'})
-        # Zn atom with tetrahedral geometry (coordination number 4)
-        self.assertEqual(s.metal_complexes[0].coordination_num, 4)
-        self.assertEqual(s.metal_complexes[0].geometry, 'tetrahedral')
-
-    def test_1vfy(self):
-        """Phosphatidylinositol-3-phosphate binding FYVE domain of VPS27P protein (1vfy)
-        Reference: Harding. The architecture of metal coordination groups in proteins. (2004), Fig. 5
-        """
-
-        tmpmol = PDBComplex()
-        tmpmol.load_pdb('./pdb/1vfy.pdb')
-        bsid = 'ZN:A:300'
-        for ligand in tmpmol.ligands:
-            if ':'.join([ligand.hetid, ligand.chain, str(ligand.position)]) == bsid:
-                tmpmol.characterize_complex(ligand)
-        s = tmpmol.interaction_sets[bsid]
-        # Coordination by four cysteines
-        metalres = [mres.restype for mres in s.metal_complexes]
-        self.assertEqual(set(metalres), {'CYS'})
-        # Zn atom with tetrahedral geometry (coordination number 4)
-        self.assertEqual(s.metal_complexes[0].coordination_num, 4)
-        self.assertEqual(s.metal_complexes[0].geometry, 'tetrahedral')
-
-    def test_2pvb(self):
-        """Pike parvalbumin binding calcium (2pvb)
-        Reference: Harding. The architecture of metal coordination groups in proteins. (2004), Fig. 6
-        """
-
-        tmpmol = PDBComplex()
-        tmpmol.load_pdb('./pdb/2pvb.pdb')
-        bsid = 'CA:A:110'
-        for ligand in tmpmol.ligands:
-            if ':'.join([ligand.hetid, ligand.chain, str(ligand.position)]) == bsid:
-                tmpmol.characterize_complex(ligand)
-        s = tmpmol.interaction_sets[bsid]
-        # Ca atom with square pyramidal geometry (coordination number 5)
-        self.assertEqual(s.metal_complexes[0].coordination_num, 5)
-        self.assertEqual(s.metal_complexes[0].geometry, 'square.pyramidal')
-
-    def test_2q8q(self):
-        """Crystal Structure of S. aureus IsdE complexed with heme (2q8q)
-        Reference: Grigg et al. Heme coordination by Staphylococcus aureus IsdE. (2007)
-        """
-
-        tmpmol = PDBComplex()
-        tmpmol.load_pdb('./pdb/2q8q.pdb')
-        bsid = 'HEM:A:300'
-        for ligand in tmpmol.ligands:
-            if ':'.join([ligand.hetid, ligand.chain, str(ligand.position)]) == bsid:
-                tmpmol.characterize_complex(ligand)
-        s = tmpmol.interaction_sets[bsid]
-        # Coordination by four nitrogens of heme itself and one additional histidine from the protein
-        metalres = [mres.restype for mres in s.metal_complexes]
-        self.assertEqual(metalres.count('HEM'), 4)
-        self.assertEqual(metalres.count('HIS'), 1)
-        # Fe atom with square pyramidal geometry (coordination number 5)
-        self.assertEqual(s.metal_complexes[0].coordination_num, 5)
-        self.assertEqual(s.metal_complexes[0].geometry, 'square.pyramidal')