Claim: L-arabinose is more common than D-arabinose with most research has been done on L-arabinose operon.
Evidence: However, L-arabinose is in fact more common than D-arabinose in nature and is found in nature as a component of biopolymers such as hemicellulose and pectin. The L-arabinose operon, also known as the araBAD operon, has been the subject of much biomolecular research. The L-arabinose operon has been a focus for research in molecular biology since 1970, and has been investigated extensively at its genetic, biochemical, physiological and biotechnical levels.