Bicoid (gene)
(重定向自Bicoid)
![(Top) Nuclear Bicoid protein gradient in a fixed transgenic Drosophila embryo carrying a bicoid–GFP fusion gene. Image courtesy of Julien O. Dubuis and Thomas Gregor. (Bottom) Bicoid–GFP protein (green) and FISH-labeled bicoid mRNA (red) in the anterior tip of a fixed transgenic Drosophila embryo. Both embryos are oriented with the anterior pole at left. Image courtesy of Shawn C. Little and Thomas Gregor (see Little et al. for methods[1]).](/Images/godic/202412/24/page1-350px-Fluorescent_labeling_of_Bicoid_GFP_and_mRNA.pdf2448.jpg")

Bicoid is a maternal effect gene whose protein concentration gradient patterns the anterior-posterior axis during Drosophila embryogenesis. Bicoid was also the first protein demonstrated to act as a morphogen.
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