Ready-to-use ELISA kits are available for the detection of T1/ST2, an alias of the protein, interleukin 1 receptor like 1. The official gene symbol is IL1RL1. The kits can detect several species variants of the protein, including: human. The protein, with a mass of 63.4 kDa and length of 556 residues, is reported to be membrane-associated and secreted. It is a member of the Interleukin-1 receptor family and may be known by other names, including: ST2L, IL33R, DER4, interleukin 1 receptor-related protein, homolog of mouse growth stimulation-expressed, and growth stimulation-expressed.