Seasonal H1N1 infection may have primed another part of the immune system, called cell-mediated immunity, which may not prevent infection but limits the severity of the disease .

Asymmetric mitoses were also observed in two other phosphorylated proteins primed for destruction, and in two other cell types: monkey cells in vitro, and Drosophila embryos in vivo.

The cells from mouse myeloma cell line SP2/0 were fused with human peripheral blood lymphocytes from the donors primed with a conventional dosage of tetanus toxoid (TT).