“Microtiter wells were coated with 10 μg/ml of Aβ in … the PEt phenomenon, we got hints that the addition of PEt … NaCl , pH 7.2 (TBS) containing 0.1% gelatin, 0.02% Tween-20 and …, might be lowering the pH, and, indeed, that was the case (Fig. 1B).”