There are multiple definitions:

1. progressive cerebello-cerebral atrophy(English)

   • Brain (dys)function, Pathology

2. Perron Cluster Cluster Analysis(English)

   • method to enable straightforward modeling of nonequilibrium systems
   • ASO, BME, DSS, HVR, ME, MSM, NMR, NOESY, PCA, RMSF, UTR
   • Entropy, Genomics, Model(ing)
   • https://doi.org…/rna.080576.125
   • https://doi.org….1063/1.5064530