Weigel D, Jürgens G, Küttner F, Seifert E, Jäckle H (1989). "The homeotic gene fork head encodes a nuclear protein and is expressed in the terminal regions of the Drosophila embryo". Cell. 57 (4): 645–658. doi:10.1016/0092-8674(89)90133-5. PMID2566386. S2CID12317967.
Weigel D, Jürgens G, Küttner F, Seifert E, Jäckle H (1989). "The homeotic gene fork head encodes a nuclear protein and is expressed in the terminal regions of the Drosophila embryo". Cell. 57 (4): 645–658. doi:10.1016/0092-8674(89)90133-5. PMID2566386. S2CID12317967.
Weigel D, Jürgens G, Küttner F, Seifert E, Jäckle H (1989). "The homeotic gene fork head encodes a nuclear protein and is expressed in the terminal regions of the Drosophila embryo". Cell. 57 (4): 645–658. doi:10.1016/0092-8674(89)90133-5. PMID2566386. S2CID12317967.