glycogen vs maltose

glycogen

noun
  • A polysaccharide that is the main form of carbohydrate storage in animals; converted to glucose as needed. 

maltose

noun
  • A disaccharide, C₁₂H₂₂O₁₁ formed from the digestion of starch by amylase; is converted to glucose by maltase; it is an isomer of trehalose 

How often have the words glycogen and maltose occurred in a corpus of books? (source: Google Ngram Viewer )