  50px D-amino acids were discovered in the 1950s : Auclair and Patton (1950) first reported their presence in the blood of insects and mollusks .
<clarity>   50px D-amino acids were discovered in the 1950s : Auclair and Patton (1950) first reported their presence in the blood of insects and mollusks .
 50px Their discovery was in the 1950s : Auclair and Patton (1950) first reported their presence in the blood of insects and mollusks .