Fig. 2. Schematic diagram of the model describing the humoral immune response from 7 days after the 2nd vaccination.

S and L stand for short- and long-lived ASCs, respectively and Ab for antibodies. The parameters δ_S, δ_L, and δ_Ab are respectively the decay rates of SL ASCs, LL ASCs, and antibodies while θ_S and θ_L represent the production rates of antibodies by SL and LL ASCs.