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Fig. 4 | Zoological Letters

Fig. 4

From: Flight feather development: its early specialization during embryogenesis

Fig. 4

Shh expression detected by section in situ hybridization in the FFF region. Cross sections around the bottom region of feather buds in the FFF region at E13 (a, d and g), E14 (b, e and h) and E15 (c, f and i) at shallow (ac), middle (df) and deep (gi) levels under the skin. Asterisk in i indicates an irregular pattern of shh expression that represents the position of the prospective rachis. j. an illustrated image showing positional relation of sections (ai) along depth direction. Scale bars: 100 μm

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