Attenuator of Hedgehog is a integral membrane protein of the tetraspan family that functions as a negative regulator of Hedgehog signaling [1].

1: CRISPR Screens Uncover Genes that Regulate Target Cell Sensitivity to the Morphogen Sonic Hedgehog. Pusapati GV, Kong JH, Patel BB, Krishnan A, Sagner A, Kinnebrew M, Briscoe J, Aravind L, Rohatgi R; Dev Cell. 2018;44:113-129. PMID:29290584