o-(adp-ribosyl)-serine true O3-alpha-D-ribofuranosyl-L-serine 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate) O3-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-serine (S)-2-amino-3-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]oxy)-propanoic acid Formula MI:0531 adp-ribosylserine PSI-MI O3-(ADP-ribosyl)-L-serine Residue modification. OBSOLETE remap to MOD:00242. O-(ADP-ribosyl)-L-serine