Lineage defects in B, F & U blast cells resulting in abnormal spicules and ectopic spicule cells. F34D10.5 rescues lin-48(sy234); it encodes a C2H2 zinc finger protein similar to Drosophila ovo. Do not distribute this strain; other labs should request it from the CGC. This strain cannot be distributed to commercial organizations. This strain cannot be used for any commercial purpose or for work on human subjects.