Protein signalling in heart development Protein signalling in heart development The heart is the first functional organ in a vertebrate embryo. There are 5 stages to heart development. Specification of cardiac precursor cells: The lateral plate mesoderm delaminates to form two layers: the dorsal somatic (parietal) mesoderm and the ventral splanchnic (visceral) mesoderm. The heart precursor cells come from the two regions of the splanchnic mesoderm called the cardiogenic mesoderm. These cells can differentiate into endocardium which lines the heart chamber and valves and the myocardium which forms the musculature of the ventricles and the atria. The heart cells are specified in anterior mesoderm by
How Are You realizes that he has to leave, as he's "gotta thousand little things I better do. Ah, but it was really good to talk to you. Be on my way, I'm bound to see you on the street again someday, and when I do I'll say How are you?" The reuniting theme of "How Are You" is also apparent in its follow-up single, "Lost and Found". "How Are You", like most Kinks tracks, is sung by Ray Davies. The track also, like many others on "Think Visual", makes use of synthesizers. "How Are You" was first released in November 1986 on