Noggin, also known as NOG, is a protein that is involved in the development of many body tissues, including nerve tissue, muscles, and bones. In humans is encoded by the NOG gene. The amino acid sequence of human noggin is highly homologous to that of rat, mouse, and Xenopus (an aquatic-frog genus).
The protein's name, which is a slang English-language word for "head," was coined in reference to its ability to produce embryos with large heads when exposed at high concentrations.
Noggin is a signaling molecule that plays an important role in promoting somite patterning in the developing embryo. It is released from the and regulates bone morphogenic protein during development. The absence of BMP4 will cause the patterning of the neural tube and somites from the neural plate in the developing embryo. It also causes formation of the head and other dorsal structures.