egl-17 expression is observed in several cells of the B lineage and the Y.p progeny Y.p(l/r)aa during L3 lethargus. The cells from B lineage appear to be in two of the socket cells, one on each side (likely _(l/r)d), B.paa and B.pppa). At the end of L4 lethargus, expression is observed in a cluster of socket cells per spicule. Shortly after male reaches adulthood, expression is maintained only in B.paa cells.