NIO

PCM

Residue type	PCM type	Category	Position	UniProt PTM accession	Entries in PDB
null	None	Non-standard residue	Amino-acid side chain and backbone (N-terminal)		0
CYS	None	Covalent chemical modification	Amino-acid side chain (Any position)		0

258009

PDB entries from 2026-08-12