Related Clues:

• Related to number one product of Swiss city's inner area
• - - oxide, colourless slightly soluble gas
• Citrin (anag.)
• - - acids
• A mostly unimportant sort of acid
• -- acid, acid of the purine group
• Egg with touches of red in centre becomes kind of acid
• Container brought back full, apart from last type of acid
• Atomic group found in glutamic acid
• Organic acid type
• Protein constituent, informally
• One type of acid
• Powdered acid used as an insecticide
• The 28-Across in proteins
• Like protein-building acids