A Northern blot loaded with total RNA from
fem-3(
q23gf) hermaphrodites that produce only sperm and
fem-1(
hc17) hermaphrodites that produce only oocytes was probed with a
spe-42 cDNA probe. A band of approximately 2500 base pairs was detected only in the
fem-3(
q23gf) lane indicating that
spe-42 is expressed solely in male germ cells.