Ttyh1, a Ca(2+)-binding protein localized to the endoplasmic reticulum, is required for early embryonic development.
Kumada T, Yamanaka Y, Kitano A, Shibata M, Awaya T, Kato T, Okawa K, Abe T, Oshima N, Nakahata T, et al. Dev Dyn. 2010 Aug; 239(8):2233-45.