Synonyms:DER4, FIT 1, IL1RL1, interleukin 1 receptor like 1, Protein ST2, ST2, ST2L, ST2V, T1 Background:Protein ST2, also known as IL1RL1, is a member of the interleukin 1 receptor family. The gene of ST2 encodes three splice variants: a soluble secreted form, a transmembrane form and a form of undetermined localization.This antibody recognizes at least 80kd, 40kd and 30kd forms in different tissues and cells.