Learn how to use this product Fetal Bovine Serum (FBS), Tetracycline Negative, is a widely used serum in eukaryotic cell culture, generally as a supplement for growth media. FBS contains nutritional and embryonic growth-promoting factors essential for a successful cell culture. Further, FBS contains various small molecules, such as lipids, amino acids, hormones, and sugars. FBS is the blood component obtained after coagulation and removal of cellular components. This unique and comprehensive mix makes FBS one of the most essential supplements for supporting cell growth and proliferation for in vitro cell culture. The fetal bovine serum for cell culture supports most cell lines and undergoes strict quality controls. This product is collected in South America. Capricorn Scientificâ„¢ has established a test with an external laboratory that uses liquid chromatography-tandem mass spectroscopy to detect all types of tetracycline. This method allows for the accurate detection of Chlortetracycline and Oxytetracycline in a range of 0.05 mg/l. The tetracycline-negative FBS is required for cell culture applications with tet-inducible gene expression systems and other applications where the presence of tetracycline would be disturbing.