Detailed Instructions: Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
Q: Lewy bodies and coarse Lewy neurites are the pathological hallmarks of degenerating neurons in the brains of patients suffering from Parkinson's disease (PD). Recently, the presynaptic protein alpha-synuclein was shown to be a major component of Lewy bodies and Lewy neurites. This study demonstrates for the first time that extensive and thin alpha-synuclein-immunoreactive inclusions are present in the axonal processes of neurons.
A:
Which is the primary protein component of Lewy bodies?