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Fig. 5 Comparison of ptc1 and shh expression in floating head and no tail mutant embryos. Expression of ptc1 (A,C,E) and shh (B,D,F) in flh mutant embryos. (A,B) Embryos at the 5-somite stage. (C,D) Embryos at 24 hours of development. Brackets and bars indicate modulation of ptc1 in different rhombomeres which is unrelated to shh expression. (E,F) Lateral view of the trunk of embryos shown in C,D. Expression of ptc1 and shh in ntl mutant embryos. (G) ntl mutant embryos at 24 hours of development. ptc1 expression is revealed in red, shh in blue. (H) Lateral view of the trunk of a 24-hour-old ntl embryo in which ptc1 expression is revealed in blue.