Y26D4A.12 encodes a putative secreted TIL-domain protease inhibitorparalogous to SWM-1, ISL-1, and the products of 11 other C. elegansgenes; Y26D4A.12 and its relatives are collectively similar to otherTIL-domain protease inhibitors from nematodes, insects, and vertebrates;Y26D4A.12 has no obvious function in mass RNAi assays.