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Fig. 2. Ventricular and atrial myocardial progenitors are spatially organized at
40% epiboly. (A) The coordinates of our fate map projected onto a lateral view
at 40% epiboly; background image adapted, with permission, from Karlstrom and
Kane (Karlstrom and Kane,
1996). Latitude, on the vertical axis, is expressed in tiers, or
cell diameters, from the margin. Longitude, on the horizontal axis, is
expressed in degrees around the circumference of the embryo, with the center
of Tg(gsc:gfp) expression defined as 0°. (B) Fate map of
myocardial chamber progenitors. Each horizontal bar represents an individual
experimental embryo. The position of a bar on the map corresponds with the
location of labeled blastomeres. Bar color indicates myocardial contribution
of labeled cells: red, contribution to ventricular myocardium; yellow,
contribution to atrial myocardium; black, no myocardial progeny. All data from
Table 1, except for experiments
labeling five blastomeres, are included. As progenitor distribution, chamber
contribution and density appear equivalent on both the left and right sides of
the embryo (Table 1), the data
are summarized together in the fate map. Compiling all data, ventricular
myocardial progenitors are found 60-125° from dorsal in tie rs 1, 2 and 3.
By contrast, atrial myocardial progenitors are found 90-140° from dorsal
in tiers 2, 3 and 4.
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