Detailed Instructions: In this task, you are given a sentence. You are expected to write the name of the organism substances in the body mentioned in the input. Although there might be several correct answers, you need to write one of them.
Q:  As GM1 is a major component of lipid rafts and recent studies suggest that Abeta accumulation in these lipid rafts is an early event in AD development , GM1 might play an important role in the early steps in AD pathogenesis [ 155 , 156 ] .
A:
lipid rafts