The bam promoter drives expression of a constitutively active form of tkv (in which the glutamine at amino acid 253 has been replaced with aspartic acid).
fertile | female limited
sterile | male limited
testis
Flies expressing tkvca.bam undergo normal oogenesis.
Flies expressing tkvca.bam are sterile and their testes are filled with many undifferentiated germ cells lacking bam expression.