2.2 SQUARE inside PROTEIN p0 inside PROTEIN p1 inside PROTEIN p2 inside PROTEIN p3 inside PROTEIN p4 inside SIMPLE_MOLECULE Uroporphyrinogen_space_III inside SIMPLE_MOLECULE Hydroxymethylbilane inside RNA L_minus_Glutamyl_minus_tRNA_space_Glu_space_ inside SIMPLE_MOLECULE Porphobilinogen inside SIMPLE_MOLECULE Siroheme inside SIMPLE_MOLECULE L_minus_Glutamate inside SIMPLE_MOLECULE Sirohydrochlorin inside SIMPLE_MOLECULE Precorrin_space_2 STATE_TRANSITION Porphobilinogen Hydroxymethylbilane c3 c1 STATE_TRANSITION Uroporphyrinogen_space_III Precorrin_space_2 c0 c7 STATE_TRANSITION Precorrin_space_2 Sirohydrochlorin c7 c6 STATE_TRANSITION Sirohydrochlorin Siroheme c6 c4 STATE_TRANSITION L_minus_Glutamate L_minus_Glutamyl_minus_tRNA_space_Glu_space_ c5 c2