id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
1878	Smarter handling of ATOM/HETATM column 21	p.qian@…	Eric Pettersen	"Column 21 of ATOM/HETATM records is not officially assigned a meaning and currently is interpreted as the fourth character of the residue name (useful for Amber-compatible terminal residue names).  COOT (and possibly other programs) use that column as part of a two-character chain ID instead.  The proposal to try to allow for that is:

On input:  if that column produces consistent 2-character chain IDs with each TER-card-delimited section, then treat as part of chain ID, otherwise as part of residue name (moot if column is all spaces of course).

On output:  If multi-character chain IDs in use, use as chain ID, otherwise as part of residue name."	enhancement	closed	moderate		Input/Output		fixed		Elaine Meng jacob_r_anderson@…				all	ChimeraX