Assertion: stem cell's level | /r/CapableOf | observe in mass germ cells
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Source sentences:
text: The high levels of pSMAD observed in mass germ cells suggest that the somatic support cells may normally function in either physically restricting TGF-β signaling from reaching germ cells away from the hub or in providing cues that down-regulate the ability of germ cells to respond to TGF-β signaling.