胎牛血清是指胎牛血液凝固后，去除血漿中纖維蛋白原及某些凝血因子后分離出的淡黃色澄清液體，它是肉類加工業的一個副產品。
胎牛血清是細胞培養中用量較大的天然培養基，含有豐富的細胞生長必須的營養成分，具有極為重要的功能，一般添加比例為：5-20%。血清中含有各種氨基酸、維生素、無機物、脂類物質等這些維持細胞生長必須的營養物質，也含有胰島素、氫化可的松、地塞米松、bFGF、EGF、PDGF、轉鐵蛋白等可促進細胞生長的激素、生長因子及結合蛋白。此外，血清還有解毒、緩沖、抑制蛋白酶活性等作用保護細胞不受傷害。
依科賽胎牛血清均采自非疫區的健康牛，經無菌采集、批量混合、3級100 nm過濾器過濾分裝而成，不含支原體和BVDV、PI3、IBR、BTV等牛源病毒。
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