Fig. 1 dorso-ventral gradient of expression at the margin, expressed at the border of neural / non neural territories, axis

Fig. 2 neural plate border (more anteriorly), posterior notochord, posterior part of the tail bud

Fig. 3 forebrain, hindbrain, Kupffer’s vesicle or chordo-neural hinge, ventral caudal epidermis

Fig. 4 forebrain ventricular zone, hypothalamus, hindbrain, otic vesicle

Fig. 5 forebrain ventricular zone, hypothalamus, hindbrain, otic vesicle, endoderm primoridum (gall bladder ?)

Fig. 6 one diencephalic nucleus, otic vesicle, one endoderm primordium