P70S6K1, or Ribosomal protein S6 kinase, 70kDa, polypeptide 1, is a human gene encoded by RPS6KB1. It may also be known as: Ribosomal protein S6 kinase beta-1; S6K1; 70 kDa ribosomal protein S6 kinase 1; P70S6K1; p70-S6K 1; Ribosomal protein S6 kinase I; Serine/threonine-protein kinase 14A; p70 ribosomal S6 kinase alpha; p70 S6 kinase alpha; p70 S6K-alpha; p70 S6KA; S6K-beta-1; PS6K; S6K; STK14A; p70(S6K)-alpha; p70-S6K; p70-alpha. The encoded protein is an enzyme with an amino acid length of 525 and a mass of 59.1 kDa. Other isoforms may exist. P70S6K1 is a member of the Protein kinase superfamily, AGC Ser/Thr protein kinase family, S6 kinase subfamily. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.