A slightly different version of the MISC@1 hypothesis is that a different type of nucleic acid , such as ORGANIZATION@1 , ORGANIZATION@2 or ORGANIZATION@3 , was the first one to emerge as a self-reproducing molecule , to be replaced by RNA only later .

A slightly different version of this hypothesis is that a different type of nucleic acid , such as ORGANIZATION@1 , ORGANIZATION@2 or ORGANIZATION@3 , was the first one to emerge as a self-reproducing molecule , to be replaced by RNA only later .
