We compared animals that produce oocytes but no sperm
fem-2(
b245ts) to animals that produce sperm but no oocytes
fem-3(
q20ts). Using miRNA microarrays and we found that the
mir-35-41 cluster genes were expressed to much greater extent in oogenesis than in spermatogenesis; furthermore, these miRNAs were the only C. elegans miRNAs that showed such differential germline expression.