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Bovine serum albumin (BSA) is a serum albumin protein derived from cows. It is often used as a protein concentration standard in lab experiments. BSA is often used a model for other serum albumin proteins, especially human serum albumin, to which it is 76% structurally homologous. BSA has numerous biochemical applications including ELISAs (Enzyme-Linked Immunosorbent Assay), immunoblots, and immunohistochemistry. Because BSA is a small, stable, moderately non-reactive protein, it is often used as a blocker in immunohistochemistry.