RPTOR and myopathy: However, adding pharmacological mTORC1 inhibition to Raptor k.o. and mTOR k.o. mice was sufficient to induce a very rapid myopathy, while not affecting wild‐type mice, suggesting the presence of residual mTORC1 signalling in the Raptor k.o. and mTOR k.o. 1 month after deletion, which is sufficient for maintaining muscle homeostasis.