2.2 SQUARE inside PROTEIN p0 inside PROTEIN p1 inside SIMPLE_MOLECULE Protoporphyrinogen_space_IX inside SIMPLE_MOLECULE Coproporphyrinogen_space_III inside RNA L_minus_Glutamyl_minus_tRNA_space_Glu_space_ inside SIMPLE_MOLECULE L_minus_Glutamate STATE_TRANSITION Coproporphyrinogen_space_III Protoporphyrinogen_space_IX c1 c0 STATE_TRANSITION L_minus_Glutamate L_minus_Glutamyl_minus_tRNA_space_Glu_space_ c3 c2