MSH: A nucleoside that is composed of adenine and d-ribose. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. Adenosine itself is a neurotransmitter.,CSP: nucleoside that is composed of adenine and d-ribose; adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA; adenosine itself is a neurotransmitter.,CHV: a kind of nucleic acid,NCI: A nucleoside that is composed of adenine and d-ribose. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. Adenosine itself is a neurotransmitter. (MeSH)