TP53 and malignant colon neoplasm: In parallel with the cytosolic and mitochondrial ATP measurements, we also monitored mitochondrial membrane potential (Δψm) by employing the membrane-permeant cationic fluorescent probe, TMRM, to determine whether mutations in KRAS and TP53 genes may affect, in human colon cancer cells, also this bioenergetic parameter in response to nutrients availability.