This domain is found in Interleukin-4 inducing protein alpha-1 (IPSE/alpha-1) present in Schistosoma mansoni, a parasite of humans. IPSE/alpha-1 triggers the release of IL-4 from basophils in the liver which is a major site of egg deposition during S. mansoni infection. This domain adopts a beta gamma-crystallin fold that is stabilized by three disulfide bonds within the domain (23/26, 59/93, and 111/121). The domain is involved in immunoglobulin binding [1].

1: 1H, 13C and 15N chemical shift assignments of IPSEDeltaNLS. Meyer NH, Schramm G, Sattler M; Biomol NMR Assign. 2011;5:225-227. PMID:21516468