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From the options below, select the true instances of cell death being part of normal development of the nervous system.
Select ALL that apply.
Elimination of excess motor neurons that failed to establish appropriate connections with muscle cells and thus became deprived of muscle-derived cell survival factors.
Elimination of excess of oligodendrocytes that failed to myelinate a nerve fiber and thus became deprived of axon-derived cell survival factors.
Degeneration of cerebellar Purkinje neurons that express the mutant form of the ATXN1 gene.
Stereotypical cell death observed in the proliferative areas of the developing human telencephalon, ventricular zone, and later subventricular zone, around mid-gestation.