Bovine Serum Albumin( also known as BSA or “Fraction V”) is a serum albumin protein derived from bovine blood .It is often used as a protein concentration standard in lab experiments.

Term “Fraction V” refers to albumin being the fifth fraction of the original Edwin Cohn purification methodology that makes use of the differential solubility characteristics of plasma proteins.

BSA has numerous biochemical applications including ELISAs(Enzyme-Linked Immunosorbent Assay), immunoblots, and immunohistochemistry. It is also used as a stabilizer and cell growth supplement in cell and microbial cultures.