Appel, L.F., Prout, M., Abu-Shumays, R., Hammonds, A., Garbe, J.C., Fristrom, D., Fristrom, J. (1993). The Drosophila Stubble-stubbloid gene encodes an apparent transmembrane serine protease required for epithelial morphogenesis.
Proc. Natl. Acad. Sci. U.S.A. 90(11): 4937--4941.