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Principal component analysis of bacteria of CNS regions from ALS patients and AD patients. (A) Three-dimensional (3D) principal component analysis (PCA) between different CNS regions from 11 ALS patients. (B) 3D PCA between ALS and AD patients. MC, motor cortex; MD, medulla; SC, spinal cord, SC1, SC2, and SC3, three samples from different regions of the spinal cord.
