Assertion: telencephalon's cell | /r/CapableOf | express mutant protein
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Source sentences:
text: In these experiments, SHH responsiveness has been ablated either through the expression of a delta-loop deletion mutant of PTC1 that renders cells expressing this mutant protein insensitive to the endogenous ligand, or through the generation of Smo -null chimaeras, in which SHH non-responsive cells were intermingled with wild-type cells in the neural tube.