A gut-brain link for Parkinson’s gets a closer look

The misfolded proteins may start with microbes in the digestive system

John Carlin and his wife Martha

GUT INSTINCT John Carlin (left) was diagnosed with Parkinson’s disease 16 years ago. His wife, Martha (right), founded a company to help research the theory that gut microbes play a role in the disease.

Matt Nager

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