GC vs germinal center

GC

name

  • the General Committee, the general management committee of a constituency party of the British Labour Party 

  • Nintendo GameCube 

germinal center

noun

  • A site in lymph nodes and the spleen where mature B cells proliferate, differentiate, and mutate their antibody genes. 

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