restype_atoms
=============

20种氨基酸对应原子种类。

+-------+---------------------------------------------------------------------------------------------+
| key   | value                                                                                       |
+=======+=============================================================================================+
| ALA   | ['C', 'CA', 'CB', 'N', 'O']                                                                 |
+-------+---------------------------------------------------------------------------------------------+
| ARG   | ['C', 'CA', 'CB', 'CG', 'CD', 'CZ', 'N', 'NE', 'O', 'NH1', 'NH2']                           |
+-------+---------------------------------------------------------------------------------------------+
| ASP   | ['C', 'CA', 'CB', 'CG', 'N', 'O', 'OD1', 'OD2']                                             |
+-------+---------------------------------------------------------------------------------------------+
| ASN   | ['C', 'CA', 'CB', 'CG', 'N', 'ND2', 'O', 'OD1']                                             |
+-------+---------------------------------------------------------------------------------------------+
| CYS   | ['C', 'CA', 'CB', 'N', 'O', 'SG']                                                           |
+-------+---------------------------------------------------------------------------------------------+
| GLU   | ['C', 'CA', 'CB', 'CG', 'CD', 'N', 'O', 'OE1', 'OE2']                                       |
+-------+---------------------------------------------------------------------------------------------+
| GLN   | ['C', 'CA', 'CB', 'CG', 'CD', 'N', 'NE2', 'O', 'OE1']                                       |
+-------+---------------------------------------------------------------------------------------------+
| GLY   | ['C', 'CA', 'N', 'O']                                                                       |
+-------+---------------------------------------------------------------------------------------------+
| HIS   | ['C', 'CA', 'CB', 'CG', 'CD2', 'CE1', 'N', 'ND1', 'NE2', 'O']                               |
+-------+---------------------------------------------------------------------------------------------+
| ILE   | ['C', 'CA', 'CB', 'CG1', 'CG2', 'CD1', 'N', 'O']                                            |
+-------+---------------------------------------------------------------------------------------------+
| LEU   | ['C', 'CA', 'CB', 'CG', 'CD1', 'CD2', 'N', 'O']                                             |
+-------+---------------------------------------------------------------------------------------------+
| LYS   | ['C', 'CA', 'CB', 'CG', 'CD', 'CE', 'N', 'NZ', 'O']                                         |
+-------+---------------------------------------------------------------------------------------------+
| MET   | ['C', 'CA', 'CB', 'CG', 'CE', 'N', 'O', 'SD']                                               |
+-------+---------------------------------------------------------------------------------------------+
| PHE   | ['C', 'CA', 'CB', 'CG', 'CD1', 'CD2', 'CE1', 'CE2', 'CZ', 'N', 'O']                         |
+-------+---------------------------------------------------------------------------------------------+
| PRO   | ['C', 'CA', 'CB', 'CG', 'CD', 'N', 'O']                                                     |
+-------+---------------------------------------------------------------------------------------------+
| SER   | ['C', 'CA', 'CB', 'N', 'O', 'OG']                                                           |
+-------+---------------------------------------------------------------------------------------------+
| THR   | ['C', 'CA', 'CB', 'CG2', 'N', 'O', 'OG1']                                                   |
+-------+---------------------------------------------------------------------------------------------+
| TRP   | ['C', 'CA', 'CB', 'CG', 'CD1', 'CD2', 'CE2', 'CE3', 'CZ2', 'CZ3', 'CH2', 'N', 'NE1', 'O']   |
+-------+---------------------------------------------------------------------------------------------+
| TYR   | ['C', 'CA', 'CB', 'CG', 'CD1', 'CD2', 'CE1', 'CE2', 'CZ', 'N', 'O', 'OH']                   |
+-------+---------------------------------------------------------------------------------------------+
| VAL   | ['C', 'CA', 'CB', 'CG1', 'CG2', 'N', 'O']                                                   |
+-------+---------------------------------------------------------------------------------------------+