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Bates College seniors Alexandra Steverson, left, and Gwen Caffrey, right, present their work on their senior thesis for friends and family during the 10th annual Mount David Summit in Pettengill Hall on Friday. Steverson, a biochemistry major, explained how lead affects the proteins and a child’s brain. Caffrey’s work was on how Lyme disease affects the genetics in animals. More than 350 students participated in the summit.
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