2.2 SQUARE inside PROTEIN p0 inside PROTEIN p1 inside PROTEIN p2 inside SIMPLE_MOLECULE N_minus_Methylhydantoin inside SIMPLE_MOLECULE N_minus_Carbamoylsarcosine inside SIMPLE_MOLECULE Spermidine inside SIMPLE_MOLECULE _space_S_space__minus_1_minus_Pyrroline_minus_5_minus_carboxylate inside SIMPLE_MOLECULE L_minus_Proline inside SIMPLE_MOLECULE Putrescine STATE_TRANSITION L_minus_Proline _space_S_space__minus_1_minus_Pyrroline_minus_5_minus_carboxylate c4 c3 STATE_TRANSITION Putrescine Spermidine c5 c2 STATE_TRANSITION N_minus_Methylhydantoin N_minus_Carbamoylsarcosine c0 c1