Exportin 1, CRM1 homolog (yeast), or Exportin 1, is a human gene encoded by XPO1. It may also be known as: Exportin-1; Exp1; Chromosome region maintenance 1 protein homolog; chromosome region maintenance 1 homolog (yeast); CRM1. The encoded protein has an amino acid length of 1071 and a mass of 123.4 kDa. Exportin 1, CRM1 homolog (yeast) is a member of the Exportin family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Arabidopsis, Frog, Chicken.