By 1958 , Crick 's thinking had matured and he could list in an orderly way all of the key features of the protein synthesis process : The adaptor molecules were eventually shown to be tRNAs and the catalytic `` ribonucleic-protein complexes '' became known as ribosomes .
In 1958 , Crick 's listed all the key features of the protein synthesis process : The adaptor molecules were eventually shown to be tRNAs and the catalytic `` ribonucleic-protein complexes '' became known as ribosomes .