Somewhat later, however, there was excellent survival, and the head portion of the embryo could regenerate a tail segment. This tells us that the normal signaling pathways present in the embryo ...

Rahu and Ketu, the Dragon's Head and Tail, are karmic nodes, not planets, influencing spiritual growth. Rahu signifies desires and worldly ambitions, presenting opportunities and challenges, while ...

The head-tail axis, for example, determines the orientation of the two ends of the body. It was previously assumed that this axis is largely determined by the interplay between the Nodal and BMP ...