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ID of heme	Distortion Sort by saddling ruffling doming breathing	Axial ligands on heme		Function & structure
4u99-A-201	`sad. -0.27 ruf. -0.64 dom. +0.80 bre. -0.16`	HIS	chainID: A, resSeq: 103, molecule: NO-binding heme-dependent sensor protein	unclassified oligomeric count: 1 pocket vol.: 421.0 Å³ d(Fe-oop): 0.252 Å
4u99-A-201	`sad. -0.27 ruf. -0.64 dom. +0.80 bre. -0.16`	Not assigned.
4u99-B-201	`sad. -0.35 ruf. -0.58 dom. +0.83 bre. -0.17`	HIS	chainID: B, resSeq: 103, molecule: NO-binding heme-dependent sensor protein	unclassified oligomeric count: 1 pocket vol.: 449.0 Å³ d(Fe-oop): 0.240 Å
4u99-B-201	`sad. -0.35 ruf. -0.58 dom. +0.83 bre. -0.17`	Not assigned.