PI3 is an elastase-specific protease inhibitor, which contains a WAP-type four-disulfide core (WFDC) domain, and is thus a member of the WFDC domain family. Most WFDC gene members are localized to chromosome 20q12-q13 in two clusters: centromeric and telomeric. PI3 belongs to the centromeric cluster. Source: Recombinant protein corresponding to aa23-117 from human PI3, fused to His-tag at N-terminal expressed in E. coli. Molecular Weight: ~12kD (118aa) AA Sequence: MGSSHHHHHH SSGLVPRGSH MGSAVTGVPV KGQDTVKGRV PFNGQDPVKG QVSVKGQDKV KAQEPVKGPV STKPGSCPII LIRCAMLNPP NRCLKDTDCP GIKKCCEGSC GMACFVPQ Storage and Stability: May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 6 months after receipt at -20C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.