Dr. francis crick's 1970 paper, central dogma of molecular biology, was on the biopolymers (dna, rna, and protein) and the "transfers" between each polymer both the original categorization of transfers from 1958 and then his proposed new groups re-organized transfers.
"in the old categorizations of information transfer he lists transfers that "almost certainly existed", transfers that were "rare or absent" and those that were "unlikely to occur". what biopolymer transfers fell into these categories? "