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
I Belong to You/How Many Ways I Belong to You/How Many Ways "I Belong to You"/"How Many Ways", alternatively "How Many Ways"/"I Belong to You" in the vinyl edition, is the fifth and final single from American R&B singer Toni Braxton's self-titled debut album, "Toni Braxton" (1993). The single was released in the United States in 1994 with both songs as double-sided songs. "I Belong to You" was written by Vassal Benford and Ronald Spearman and produced by Benford. While there was no music video for "I Belong to You", the song garnered Braxton a nomination for Best Female R&B Vocal Performance at the 1996 Grammy