Potassium large conductance calcium-activated channel, subfamily M, alpha member 1, or Potassium channel, calcium activated large conductance subfamily M alpha, member 1, is a human gene encoded by KCNMA1. It may also be known as: Calcium-activated potassium channel subunit alpha-1; BK channel; BKCA alpha; Calcium-activated potassium channel, subfamily M subunit alpha-1; K(VCA)alpha; KCa1.1; Maxi K channel; MaxiK; Slo-alpha; Slo1; Slowpoke homolog; Slo homolog; hSlo; BK channel alpha subunit; maxiK channel; big potassium channel alpha subunit; BKTM; SAKCA; SLO; bA205K10.1; mSLO1. The encoded protein has an amino acid length of 1236 and a mass of 137.6 kDa. Other isoforms may exist. Potassium large conductance calcium-activated channel, subfamily M, alpha member 1 is a member of the Potassium channel family, Calcium-activated (TC 1.A.1.3) subfamily, KCa1.1/KCNMA1 sub-subfamily. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.