HNRNPA2B1 and tauopathy: To determine if hnRNP A1, hnRNP A2B1, or hnRNP K colocalize with pTau aggregates in tauopathies, we costained human postmortem tissue sections for phosphorylated tau (AT8 antibody; pTau S202/T205) and each of the target hnRNPs.