thiophosphorylated residue modified L-threonine residue O-thiophospho-L-threonine 196.9911651611328125 197.1399993896484375 95.94348907470703125 96.04000091552734375 A protein modification that effectively converts an L-threonine residue to O-thiophospho-L-threonine. C 4 H 8 N 1 O 4 P 1 S 1 H 1 O 2 P 1 S 1 MOD:01361 PSI-MOD T Thiophospho Thiophosphorylation Unimod:260 artifact