Two different groups of researchers are studying alternative methods of treating Parkinson's disease. Group A found an enzyme that has similar mechanism of action to the female black widow spider venom in the synapse. Group B found a molecule that has similar mechanism of action as curare but for dopamine molecules instead of acetylcholine molecules. You are a member of the Natural Sciences and Engineering Research Council of Canada (NSERC) and must decide which of the two groups of researchers can obtain the grant for Parkinson's disease research. 

Which of the two groups of researchers should receive the grant money? (1 mark)  Explain your reasoning by comparing and contrasting the mechanism of actions between the two neurotoxin molecules and dopamine neurotransmitter. (3 marks)