2.2 SQUARE inside PROTEIN p0 inside PROTEIN p1 inside PROTEIN p2 inside PROTEIN p3 inside PROTEIN p4 inside PROTEIN p5 inside PROTEIN p6 inside SIMPLE_MOLECULE _space_4_minus_Imidazolone_minus_5_minus_propanoate inside SIMPLE_MOLECULE Urocanate inside RNA L_minus_Histidyl_minus_tRNA_space_His_space_ inside SIMPLE_MOLECULE Hydantoin_minus_5_minus_propionate inside SIMPLE_MOLECULE _space_3_minus_Methylimidazole_space_acetaldehyde inside SIMPLE_MOLECULE L_minus_Histidine inside SIMPLE_MOLECULE _space_3_minus_Methylimidazoleacetic_space_acid inside SIMPLE_MOLECULE Imidazole_minus_4_minus_acetaldehyde inside SIMPLE_MOLECULE _space_1H_minus_Imidazole_minus_4_minus_ethanamine inside SIMPLE_MOLECULE Imidazole_minus_4_minus_acetate STATE_TRANSITION L_minus_Histidine _space_1H_minus_Imidazole_minus_4_minus_ethanamine c5 c8 STATE_TRANSITION L_minus_Histidine Urocanate c5 c1 STATE_TRANSITION _space_3_minus_Methylimidazole_space_acetaldehyde _space_3_minus_Methylimidazoleacetic_space_acid c4 c6 STATE_TRANSITION _space_4_minus_Imidazolone_minus_5_minus_propanoate Hydantoin_minus_5_minus_propionate c0 c3 STATE_TRANSITION L_minus_Histidine L_minus_Histidyl_minus_tRNA_space_His_space_ c5 c2 STATE_TRANSITION Urocanate _space_4_minus_Imidazolone_minus_5_minus_propanoate c1 c0 STATE_TRANSITION Imidazole_minus_4_minus_acetaldehyde Imidazole_minus_4_minus_acetate c7 c9