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Schematic overview of the different cardiac progenitor populations. Precursors of the embryonic ventricle (ev), the future left ventricle (lv), are mainly derived from the first heart field (light gray), whereas precursors of the outflow tract (oft), right ventricle (rv) and atria (left atrium, la; right atrium, ra) are derived from the second heart field (gray). The Tbx18+ caudal heart field (dark gray) forms the sinus horns (sh). A, anterior; L, left; P, posterior; R, right.
