Alpha Tubulin, or Tubulin alpha 1b, is a human gene encoded by TUBA1B. It may also be known as: Tubulin alpha-1B chain; Tubulin K-alpha-1; Tubulin alpha-ubiquitous chain; Alpha-tubulin ubiquitous; tubulin, alpha, ubiquitous; K-ALPHA-1; tubulin, alpha 1b. The encoded protein has an amino acid length of 451 and a mass of 50.2 kDa. Homologs of this gene exist in other organisms, including: Arabidopsis.