Sonic hedgehog (Shh) is a key signaling molecule that plays an important role in embryonic development, particularly in the patterning of the nervous system, limbs, and other organs. The protein encoded by the sonic hedgehog gene is part of the Hedgehog family of signaling molecules and is named after the popular video game character. Research in the field of sonic hedgehog focuses on understanding its role in development and disease, particularly in cancer where abnormal activation of the pathway can lead to tumor growth. Scientists study the mechanisms by which Shh signaling affects cell differentiation, proliferation, and migration, as well as the potential therapeutic applications of targeting this pathway in various diseases. Overall, research in the field of sonic hedgehog has provided valuable insights into the fundamental processes of development and may lead to new treatments for a range of disorders.