Myosin is a hexameric ATPase cellular motor protein. It is composed of two myosin heavy chains, two nonphosphorylatable myosin alkali light chains, and two phosphorylatable myosin regulatory light chains. This gene encodes a myosin alkali light chain that is found in embryonic muscle and adult atria. Two alternatively spliced transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]
giant (gt) encodes a transcription factor in the basic leucine zipper family. It is one of the "gap" transcription factors, transcribed very early in embryonic development, that help to divide the embryo along the anteroposterior axis.