Structural features of residue 21 in chain B

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Electrostatic Interactions:
ARG B 20 NH1	HIS B 21 NE2	2.911	INTRA-CHAIN
ARG B 20 NH2	HIS B 21 NE2	2.869	INTRA-CHAIN
HIS B 21 ND1	ARG B 20 NH1	2.829	INTRA-CHAIN
HIS B 21 ND1	HIS D 60 ND1	0.696	INTER-CHAIN
HIS B 21 ND1	HIS D 60 NE2	1.568	INTER-CHAIN
HIS B 21 ND1	HIS F 65 ND1	0.767	INTER-CHAIN
HIS B 21 ND1	HIS F 65 NE2	1.649	INTER-CHAIN
HIS B 21 ND1	ARG F 70 NH1	2.274	INTER-CHAIN
HIS B 21 NE2	ARG B 20 NH1	2.911	INTRA-CHAIN
HIS B 21 NE2	HIS F 65 ND1	0.683	INTER-CHAIN
HIS B 21 NE2	ARG F 70 NH1	2.618	INTER-CHAIN
HIS D 60 ND1	HIS B 21 ND1	0.696	INTER-CHAIN
HIS D 60 NE2	HIS B 21 ND1	0.697	INTER-CHAIN
HIS F 65 ND1	HIS B 21 ND1	0.767	INTER-CHAIN
HIS F 65 ND1	HIS B 21 NE2	1.536	INTER-CHAIN
HIS F 65 NE2	HIS B 21 ND1	0.733	INTER-CHAIN
ARG F 70 NH1	HIS B 21 NE2	2.618	INTER-CHAIN
ARG F 70 NH2	HIS B 21 NE2	2.320	INTER-CHAIN

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Van der Waal's Interactions:
SER B 9 OG 725	HIS B 21 NE2 846	-0.034	INTRA-CHAIN
HIS B 21 NE2 846	PRO A 62 CD 539	-0.008	INTER-CHAIN