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图3 组氨酸、苯丙氨酸、脯氨酸、色氨酸以及酪氨酸的HOMO、LUMO轨道及静电势(ESP)分布
Fig.3 HOMO (left), LUMO (middle) orbital and electrostatic potential (ESP) distribution of histidine (a), phenylalanine (b), proline (c), tryptophan (d) and tyrosine (e)