Western blots confirm the presence of HC, LC, and J
chain. Milk samples from control mice secreting HUMIRA
IgA, previously unpublished, or ZAC-3 hIgA1 founder females, numbers
144, 21, 59 containing the BC3239 and BC3242 constructs were
analyzed via western blot for (A) Kappa light chain and (B) human
IgA. Lanes 1, 2, containing positive control Human IgA and lane 5,
containing milk from founder female 21, exhibit highly positive
signal for both Kappa LC and IgA. (C) Western blot showing that milk
from mouse 21 is also positive for J-chain in comparison to positive
controls. Data in (C) also includes preliminary findings from ZAC-3
IgA2 constructs, mouse numbers 14, 15, 16, 51, which were not
pursued. ZAC-3 hIgA founder female 21 was subsequently bred.