Two P{lacW} insertions; one in the untranslated trailer region 120bp upstream of the poly(A) addition site (P{lacW}P14a), the second (P{lacW}P14b) 73bp upstream from the original insertion in wtsP509-19 and in the same orientation as that insertion.
Homozygotes exhibit embryonic or early larval lethality. wts tumour phenotype in mitotic clones: overproliferation and apical hypertrophy of epithelial cells leading to abnormal deposition of cuticle.