CTA, or Phosphate cytidylyltransferase 1, choline, alpha, is a human gene encoded by PCYT1A. It may also be known as: Choline-phosphate cytidylyltransferase A; CTP:phosphocholine cytidylyltransferase A; CCT A; CT A; Phosphorylcholine transferase A; Choline-phosphate cytidylyltransferase A ; phosphate cytidylyltransferase 1, choline, alpha isoform; CT; CTPCT; PCYT1; SMDCRD. The encoded protein is an enzyme with an amino acid length of 367 and a mass of 41.7 kDa. CTA is a member of the Cytidylyltransferase family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog, Chicken.