As a Contract Research Organization (CRO) specializing in neurobiology research, we understand the critical role of aberrant tau protein aggregation in neurodegenerative diseases such as Alzheimer’s disease. (AD). Our highly sensitive in vitro tau uptake and seeding assays provide comprehensive support to research institutions and pharmaceutical companies, spanning from fundamental research to preclinical development. Tau protein uptake is a critical step in the insidious spread of tau pathology throughout the brain in neurodegenerative diseases like AD and frontotemporal dementia. Understanding the mechanisms by which tau is taken up by neurons—including endocytosis, transmembrane diffusion, and axonal transport—is crucial for developing therapies that can halt or slow disease progression.