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). The serine at amino acid 238 has been replaced by alanine.
hyperplasia | adult stage
female germline cell | increased number
germarium
ovary
Expression of tkvS238A.ca.bam results in germaria that contain an increased number of spectrosome-containing GSC-like cells.