Novel null alleles detected at the E3 locus in photoperiod-insensitive soybean accessions. A) Positions and types of mutations. B) Changes in predicted amino acid sequences; asterisks indicate stop codons. C) DNA markers distinguishing each of the recessive alleles from the others. Cultivars Darta and Nawiko have e3-fs and e3-ns, respectively. Harosoy has a dominant E3 allele. Marker diagnostic for e3-fs shown in left panel. Marker diagnostic for e3-ns shown in right panel. nd, not digested.