Ribozymes: Group I Intron
The self-splicing group I intron was the first ribozyme discovered. More than 1,500 varieties have been identified to date, from protozoa, fungi, algae, and bacteria. Group I introns are several hundred nucleotides long.

The self-splicing group I intron was the first ribozyme discovered. More than 1,500 varieties have been identified to date, from protozoa, fungi, algae, and bacteria. Group I introns are several hundred nucleotides long.