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Phylogenetic analysis of
the distribution of Gcm-2 and its expression in teleost (zebrafish) and
chondrichthyan (dogfish) species. (C-F) Gcm-2 expression in zebrafish
embryos. In these micrographs, anterior is to the left and ventral is to the
bottom. Gcm-2 initiates expression in the second pharyngeal pouch in early
3-day-old larval fish (indicated by arrowhead in C). Subsequently, Gcm-2 is
expressed sequentially in the more posterior pouches (D), and, by day 4,
Gcm-2 is expressed in all of the pouches (E). It is also apparent by day 4
that Gcm-2 is expressed in the developing internal gill buds emerging from
the pharyngeal pouches (F). (G and H) Gcm-2 expression in dogfish embryos.
This gene is expressed in the internal gill buds protruding from the pharyngeal
pouches in stage-27 dogfish embryos (17). The pharyngeal arches are numbered
II-VI.
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