Sequence alignment between 1iiu(A) and UniProt seq P41263 (RET4_CHICK):

P41263 (RET4_CHICK): Retinol-binding protein 4 from Gallus gallus
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190      
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------
UniProt: MAYTWRALLLLALAFLGSSMAERDCRVSSFKVKENFDKNRYSGTWYAMAKKDPEGLFLQDNVVAQFTVDENGQMSATAKGRVRLFNNWDVCADMIGSFTDTEDPAKFKMKYWGVASFLQKGNDDHWVVDTDYDTYALHYSCRELNEDGTCADSYSFVFSRDPKGLPPEAQKIVRQRQIDLCLDRKYRVIVHNGFCS
         ......................X.............................................................................................................................................................................
PDB seq: ----------------------MDCRVSSFKVKENFDKNRYSGTWYAMAKKDPEGLFLQDNVVAQFTVDENGQMSATAKGRVRLFNNWDVCADMIGSFTDTEDPAKFKMKYWGVASFLQKGNDDHWVVDTDYDTYALHYSCRELNEDGTCADSYSFVFSRDPKGLPPEAQKIVRQRQIDLCLDRKYRVIVHNGFCS
                               --------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-----
                                      10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170