Aβ40/42 Quantitation Biochemically. Shows the levels of Aβ40 and Aβ42 in the FA and DEA extracted material from brains of vehicle treated Tg (n = 8) and 6D11 treated Tg mice (n = 10). Levels from the FA extract fraction of Aβ40 and Aβ42 are shown in A and B, respectively. Levels from the DEA extract fraction of Aβ40 and Aβ42 are shown in C and D, respectively. There were no significant differences in the levels of Aβ40 or Aβ42 in either the FA or DEA fractions.