Mutants of pha-4 do not respond to bacterial DR. Therefore, loss of pha-4 completely blocks the response to varying food concentration. Reduction of pha-4 does not suppress the long lifespan of daf-2 mutants or animals with defective electron transport chain [17476212]. IF significantly extends lifespan of pha-4 [19079239]. sDR extends lifespan of mutants with a temperature sensitive allele of pha-4, but not daf-16 RNAi [19239417].
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