The incorporation of the pyrimidine ring of adenine into the isoalloxazine ring of riboflavin.
D000225:Adenine; D005415:Flavins; D005658:Fungi; D011743:Pyrimidines; D012256:Riboflavin / Q000378:metabolism*
D005415:Flavins; D011743:Pyrimidines; C008173:isoalloxazine; D000225:Adenine; C030986:pyrimidine; D012256:Riboflavin
ADENINE; FUNGI; VITAMIN B2/metabolism