The heart develops from 2 sources of mesoderm progenitors. the first and second heart field (FHF and SHF). Using a single-cell transcriptomic assay combined with genetic lineage tracing and live imaging. we find the FHF and SHF are subdivided into distinct pools of progenitors in gastrulating mouse embryos at earlier stages than previously thought. https://www.markbroyard.com/special-pick-igora-vibrance-6-0-dark-blonde-natural-supply-best-super/