Sequence alignment between 1s3a(A) and UniProt seq O43678 (NDUA2_HUMAN):

O43678 (NDUA2_HUMAN): NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 2 from Homo sapiens
                 10        20        30        40        50        60        70        80        90         
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------
UniProt: MAAAAASRGVGAKLGLREIRIHLCQRSPGSQGVRDFIEKRYVELKKANPDLPILIRECSDVQPKLWARYAFGQETNVPLNNFSADQVTRALENVLSGKA
PDB seq: --------------GLREIRIHLCQRSPGSQGVRDFIEKRYVELKKANPDLPILIRECSDVQPKLWARYAFGQETNVPLNNFSADQVTRALENVLSGKA
                       -----+---------+---------+---------+---------+---------+---------+---------+---------
                           20        30        40        50        60        70        80        90