Structural features of residue 21 in chain B

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Electrostatic Interactions:
HIS A 23 ND1	HIS B 21 ND1	2.044	INTER-CHAIN
HIS A 23 ND1	HIS B 21 NE2	3.300	INTER-CHAIN
HIS A 23 NE2	HIS B 21 ND1	1.527	INTER-CHAIN
HIS A 23 NE2	HIS B 21 NE2	2.739	INTER-CHAIN
ARG B 14 NH1	HIS B 21 NE2	7.126	INTRA-CHAIN
ARG B 14 NH2	HIS B 21 NE2	6.578	INTRA-CHAIN
HIS B 21 ND1	ARG B 14 NH1	7.603	INTRA-CHAIN
HIS B 21 ND1	HIS A 23 ND1	2.044	INTER-CHAIN
HIS B 21 ND1	HIS A 23 NE2	3.435	INTER-CHAIN
HIS B 21 ND1	HIS B 23 ND1	0.794	INTRA-CHAIN
HIS B 21 ND1	HIS B 23 NE2	1.783	INTRA-CHAIN
HIS B 21 ND1	ARG B 40 NH1	2.577	INTRA-CHAIN
HIS B 21 NE2	ARG B 14 NH1	7.126	INTRA-CHAIN
HIS B 21 NE2	HIS A 23 ND1	1.467	INTER-CHAIN
HIS B 21 NE2	HIS A 23 NE2	2.739	INTER-CHAIN
HIS B 21 NE2	HIS B 23 ND1	0.768	INTRA-CHAIN
HIS B 21 NE2	HIS B 23 NE2	1.762	INTRA-CHAIN
HIS B 21 NE2	ARG B 40 NH1	3.104	INTRA-CHAIN
HIS B 23 ND1	HIS B 21 ND1	0.794	INTRA-CHAIN
HIS B 23 ND1	HIS B 21 NE2	1.729	INTRA-CHAIN
HIS B 23 NE2	HIS B 21 ND1	0.792	INTRA-CHAIN
HIS B 23 NE2	HIS B 21 NE2	1.762	INTRA-CHAIN
ARG B 40 NH1	HIS B 21 NE2	3.104	INTRA-CHAIN
ARG B 40 NH2	HIS B 21 NE2	3.492	INTRA-CHAIN

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Hydrogen bonds:

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|Res1 type| Res1 No.| Chain1| Res2 type| Res2 No.| Chain2|
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|        H|       23|      A|         H|       21|      B|
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Protrusion Index:
HIS B 21 N	0.29
HIS B 21 CA	0.23
HIS B 21 C	0.19
HIS B 21 O	0.16
HIS B 21 CB	0.16
HIS B 21 CG	0.19
HIS B 21 ND1	0.30
HIS B 21 CD2	0.18
HIS B 21 CE1	0.41
HIS B 21 NE2	0.29

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Van der Waal's Interactions:
ARG B 14 NH2 614	HIS B 21 NE2 664	-0.071	INTRA-CHAIN
HIS B 21 NE2 664	TRP B 53 CH2 926	-0.067	INTRA-CHAIN
HIS B 21 NE2 664	ALA A 62 CB 491	-0.013	INTER-CHAIN