Gut bacterial CsgA homologs accelerate α-synuclein aggregation. Aggregation kinetics of α-synuclein alone or in presence of CsgA homologs at 37 °C. A, α-synuclein alone (blue) or in the presence of HA CsgA (red) and YR CsgA (green). B, α-synuclein alone (blue) or in the presence of CY CsgA (red) and CD CsgA (green). (Error bars represent SEM of three replicates). CD CsgA, Cedecea davisae CsgA; CY CsgA, Citrobacter youngae CsgA; HA CsgA, Hafnia alvei CsgA; YR CsgA, Yokenella regensburgei CsgA.