Bovine Serum Albumin (Low Endotoxin,Fatty acid free) (BSA) is a 583 amino acid globular protein and oligonucleotide binding protein composed of three homologous full alpha domains. Bovine Serum Albumin (Low Endotoxin,Fatty acid free) (BSA) blocks the overall binding of oligonucleotides to cells. Bovine Serum Albumin (Low Endotoxin,Fatty acid free) (BSA) regulates the development of hamster embryos and induces arthritis[1][2][3][4].