“…Among birds, electrophoretic studies revealed 1 to 3 bands, depending on the developmental stage, for the South American Eared Dove Zenaida auriculata; and, under similar circumstances, 1 to 2 bands for the mallard (Anus platyrhynchos) (52). At present, knowledge about the nature of these bands, and about the structure of sorbitol dehydrogenase in birds, is insufficient for these findings to be interpreted in genetic terms.…”