Fig 2C of Yoshikawa et al 2000 [PMID:10704880] Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(99)00320-2] Mech Dev 91: 439-44, Yoshikawa SI; Aota S; Shirayoshi Y; Okazaki K, The ActR-I activin receptor protein is expressed in notochord, lens placode and pituitary primordium cells in the mouse embryo. Copyright 2000