Fig. 7.

Summary of initial SMic specification. (A) SMic descendants (green) are mechanically de-epithelialized into the blastocoel by the contraction of the epithelia and reorganization of the vegetal plate, and are passively carried up towards the animal pole by SMCs (orange). (B) SMic specification during early development. Vasa-positive cells are indicated in red. MB, mid-blastula; EG, early gastrula; MG, mid-gastrula; LG, late gastrula; E4plu, pluteus stage; SMC, secondary mesenchyme cell; SMic, small micromere; L/R. left/right.