Molecular & Cell Biology


These are differentiating mouse embryonic stem cells (green = mesoderm progenitor cells, red = endoderm progenitor cells). The microRNAs identified in this study block endoderm formation, while enhancing mesoderm formation.
An embryo is an amazing thing. From just one initial cell, an entire living, breathing body emerges, full of working cells and organs. It comes as no surprise that embryonic development is a very carefully orchestrated process—everything has to fall into the right place at the right time. Developmental and cell biologists study this very thing, unraveling the molecular cues that determine how we become human.

Biology

Plants grow upward from a tip of undifferentiated tissue called the shoot apical meristem. As the tip extends, stem cells at the center of the meristem divide and increase in numbers. But the cells on the periphery differentiate to form plant organs, such as leaves and flowers. In between these two layers, a group of boundary cells go into a quiescent state and form a barrier that not only separates stem cells from differentiating cells, but eventually forms the borders that separate the plant's organs.

Biology

The ability of male chimpanzees to form coalitions with one another in order to direct aggression at other male chimpanzees has certain benefits. A new study by Ian Gilby at Duke University in North Carolina and his colleagues has further revealed that it may not just be the coalition that is important, but who the coalition is with that determines future success. Their study finds that male chimpanzees with central positions in the coalitionary network were most likely to father offspring and increase in rank. Specifically, those who formed coalitions with males who did not form coalitions with each other were the most successful. Their work is published in the Springer journal Behavioral Ecology and Sociobiology.




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