Delta is a ventral to dorsal signal complementary to Serrate, another Notch ligand, in Drosophila wing formation.

Doherty D, Feger G, Younger-Shepherd S, Jan LY, Jan YN. Delta is a ventral to dorsal signal complementary to Serrate, another Notch ligand, in Drosophila wing formation. Genes Dev. 1996 Feb 15; 10(4):421-34.

1996
http://profiles.ucsf.edu/profile/308584
8600026

Doherty D, Feger G, Younger-Shepherd S, Jan LY, Jan YN