the origin of neural crest-derived ectomesenchymal condensations located subjacent to scleral papillae and the development of the more deeply situated scleral ossicles were investigated in scleral tissues explanted from the eyes of chick embryos at hamburger & hamilton ( 1952 ) stages 30-38 ( 6 1/2-12 days of incubation ) .
C0027789
neural crest
C1518271
ectomesenchymal