RNA. History. mRNA and tRNA worked out in the 1960s Purification of RNA lead to 23S, 16S, and 4S species and accounted for 85% of all RNA tRNA accounted for about 15% of all RNA Hybridization experiments did not match DNA mRNA accounts for only 1-4% of RNA. Types of RNA. mRNA tRNA
These RNA species have a variety of functions and not all of them have been worked out yet.