Anti -carcinogens are:

A i.e. CarotenoidsProtooncogenes are normal cell genes that paicipate in cellular functions related to growth and proliferationQ. Proteins encoded by protooncogenes may function as growth factor, ligands and receptors, signal transducers, transcription factors and cell cycle regulatorsQ.Protooncogenes on activation become oncogenes that induce cancerQ. The process of activation include gene amplification, point mutation, inseion mutation, retroviral transduction (integration), chromosomal translocation and protein- protein interaction.Onchoproteins encoded by oncogenes have similar functions as their normal counterpas but they are constitutively expressed and endow the cell with self sufficiency in growth. Carotinoids are anticarcinogensQ.