Hsp70 family chaperone heat shock 70 kDa protein 1 An HSPA protein that is a translation product of the human HSPA1A or HSPA1B genes, 1:1 orthologs thereof, or a semi-ortholog thereof. PR:000024842 protein heat shock 70 kDa protein 1/2 HSP70.1/HSP70.2 heat shock 70 kDa protein 1A/1B HSPA1[1/2] Category=gene. Note: The human HSPA1A and HSPA1B genes encode identical proteins (that is, the main isoforms), however HSPA1A also encodes an alternatively-spliced form. HSP70-1/HSP70-2