In the study, the group measured the levels of serotonin, as well as an enzyme that makes serotonin, in tissue samples taken during autopsies of 35 infants who died from SIDS, provided by research partners at the San Diego County medical examiner's office in California.
Levels of serotonin, and the enzyme that makes it, were, on average, lower in the SIDS babies compared to babies who died of other causes.
A blood test to detect low serotonin levels in newborns "would be the ultimate goal," she said.
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