existence starts during or after
start stage
sclerotome somite 29
ZFA:0000960
zebrafish_anatomy
Ventromedial region of somite 29 that will form vertebral cartilages and connective tissues. The sclerotome lies ventral to the myotome. Cells of the sclerotome will migrate dorsally to surround the notochord and neural tube.
TAO:0000960
sclerotome
pharyngula:prim-5