Microarray analysis of the differentially regulated genes in D. melanogaster larvae responding to symbiotic Heterorhabditis bacteriophora identified Tep2 among the 100 most enriched genes as well as Tep1, and the C3 homolog Tep3 and Tep4 were also induced by infection with these nematode parasites [40]. Here, TEP1 is linked to infection.