Fig. 3. (A) Autoradiograph of Southern blot with HindIII-digested genomic DNA showing novel bands corresponding to Mu alleles. (B) Autoradiograph of northern blot of total RNA from developing ears probed with a zfl exon 3 PCR product. Signal was detected only in wild type at about 1400 nt (left). The same membrane was stripped and re-probed with maize ubiquitin cDNA (Ub).