  50px D-amino acids were discovered in the 1950s : Auclair and Patton (1950) first reported their presence in the blood of insects and mollusks . Subsequently, D-amino acids have been detected in a variety of mammalian tissues.
<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 . Subsequently, D-amino acids have been detected in a variety of mammalian tissues.
 50px D-amino acids were discovered in the 1950s : Auclair and Patton (1950) first reported their presence in the blood of insects and mollusks ” Furthermore, they also have been identified in various mammalian tissues.