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Two signals â€“ an external one from retinoic acid and an internal one from the transcription factor Neurogenin2 â€“ cooperate to activate chromatin (the basic material of chromosomes) and help determine that certain nerve progenitor cells become motor neurons, said researchers from Baylor College of Medicine (www.bcm.edu) in a report in the current issue of the journal Neuron.
Generating the different kinds of nerve cells needed for the brain and nervous system requires both promotion of some factors and inhibition of others, said researchers from Baylor College of Medicine in Houston in a report that appears in a recent edition of the journal Developmental Cell.
- To say in too many words; to express verbosely.
- To express in too many words: sometimes used reflexively.
- The leading idea or a repeated phrase, as of a song or ballad; the refrain; burden.