This family consists of several special lobe-specific silk protein SSP160 sequences which appear to be specific to Chironomus (Midge) species [1,2].

1: A cell-specific glycosylated silk protein from Chironomus thummi salivary glands. Cloning, chromosomal localization, and characterization of cDNA. Hoffman RT, Schmidt ER, Case ST; J Biol Chem 1996;271:9809-9815. PMID:8621663

2: Structure and polymorphism of the Chironomus thummi gene encoding special lobe-specific silk protein, ssp160. Berezikov E, Blinov AG, Scherbik S, Cox CK, Case ST; Gene 1998;223:347-354. PMID:9858763