Breaks in first intron of elB.
visible | recessive
Class i allele.
Hemizygotes have reduced wings, and, especially, reduced alulae.
Strong; class ii (Davis, 2003.5.6, personal communication to FlyBase provides contradictory, class i, assignment).
elB4 is an enhancer of chaeta phenotype of nocSco
Shows slight but real enhancement of "Sco" alleles.