The paired main vein, departing from the sinus venous, the fused heart primordium, it runs posteriorly down length of the embryo. [ XAO:curators ]
This is just here as a test because I lose it
The paired main vein, departing from the sinus venous, the fused heart primordium, it runs posteriorly down length of the embryo. [ XAO:curators ]