n6-retinal-lysine true N6-retinal-L-lysine [K:retin] N6-retinylidene-L-lysine PSI-MI Residue modification. OBSOLETE remap to MOD:00129. N6-retinyl-lysine (S)-2-amino-6-[(2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)-2,4,6,8-nonatetraenylidene]aminohexanoic acid KRT retinallysine MI:0188