C1orf77 Full-Length MS Protein Standard (NP_056422), Labeled with [U- 13C6, 15N4]-L-Arginine and [U- 13C6, 15N2]-L-Lysine, was produced in human 293 cells (HEK293) with fully chemically defined cell culture medium to obtain incorporation efficiency at Creative-Proteomics. This gene encodes a small nuclear protein that is characterized by a arginine and glycine rich region. The encoded protein may be involved in cell cycle progression. This protein interacts with protein arginine methyltransferases and plays a role in the activation of estradiol-dependent transcription. Alternate splicing results in multiple transcript variants.