B, C Principal component analysis (B) and hierarchical clustering (C) of the transcriptomic datasets of different tissues from young and aged worms in three biological replicates. D1: day 1 of adulthood, D8: day 8 of adulthood. Neu: neuron, Int: intestine, BWM: body wall muscle, Hyp: hypodermis, Coel: coelomocyte. 