C25E10.8 encodes a putative secreted TIL-domain protease inhibitorparalogous to SWM-1, ISL-1, and the products of 11 other C. elegansgenes; C25E10.8 and its relatives are collectively similar to otherTIL-domain protease inhibitors from nematodes, insects, and vertebrates;despite both swm-1 and C25E10.8 being mutated by the swm-1(ok1193)deletion, transgenic rescue of swm-1(ok1193) by SWM-1 alone leaves maleswith no obvious residual phenotype, indicating that C25E10.8 has noconspicuous function in vivo.