challenge: What is the primary focus of Gentry Patrick's research?
  
  A. The synthesis and degradation of proteins at synapses and their impact on neuroplasticity
  B. The study of neurodegenerative diseases in relation to muscle growth
  C. The role of the ubiquitin proteasome pathway in cell division
  D. The investigation of AMPA-type receptor trafficking in cancer cells
  Answer: 