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Fig. 2. The role of neural crest in the spatiotemporal patterning of cranial
feather buds. (A) Starting at HH34, quail feather placodes can be seen in one
medial and two lateral rows along cranial epidermis (arrow). (B) By HH35,
additional rows appear over the eyes. (C) Quail feather buds are relatively
large and widely spaced, shown schematically. (D) Duck feather placodes form
at HH34 in multiple rows over the eyes, lateral to the midline (arrow). (E)
Additional rows appear by HH35. (F) Compared with those of quail, duck feather
buds are smaller and spaced closer together, as shown schematically. (G) At
HH33, there are no cranial feather buds visible in either duck or quail (not
shown). (H) However, HH33 chimeric `quck' prematurely form feather placodes in
duck host epidermis. The extent of differentiation, size and spacing of these
quck feather buds are more like that observed in I. HH36 quail instead of
duck, which is the host species. (J-L) When quck are at HH36, their feathers
are like those found on HH39 quail. (M-O) Differences between host and donor
feathers are more apparent by HH38, when quck feathers are like those of a
quail at HH41. There is unilateral distribution of quail-derived pigment on
the duck host, which is coincident with the type of neural crest transplant
performed at HH9.5. Scale bar: 2 mm.
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