Two types of soluble TNF receptors (sTNFR-I and sTNFR-II) have been identified, which act to neutralize the biological activities of TNF alpha and TNF beta. Synonym: sTNFR I, Tumour necrosis factor receptor subfamily member 1A (TNFRSF1A), Tumour necrosis factor binding protein I (TNFBPI), Tumour necrosis factor receptor type I (TNFRI), Tumour necrosis factor-alpha receptor (TNFAR), CD120a antigen, p55, p55-R, p60, MGC19588.