A number of ELISA Kits are available that target hsp4, an alias of the protein, heat shock protein 90 alpha family class A member 1. The human protein, encoded by the gene HSP90AA1, is a member of the Heat shock protein 90 family. The protein's cellular localization is indicated to be cytoplasmic, nuclear and membrane-associated. Additional synonyms or past names for this protein may include: EL52, HEL-S-65p, HSP86, HSP89A, HSP90A, HSP90N, HSPC1, HSPCA, HSPCAL1, HSPCAL4, HSPN, Hsp103, Hsp89, Hsp90, LAP-2, LAP2. Homology is conserved in other species, such as Mouse, Rat, Chicken.