N defense or digestion [67]. WD40 repeats (also known as WD or betatransducin repeats) are involved in signal transduction and transcription regulation along with cell-cycle control and apoptosis [68,69]. Heat shock proteins, such as HSP-20 are reported to be present in the parasitic nematode, H. contortusMenon et al. BMC Genomics 2012, 13(Suppl 7):S10 http://www.biomedcentral.com/1471-2164/13/S7/