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Effects of HMWF and LMWF on natural killer (NK) cell, NK-92MI, proliferation. The NK cells were incubated with the indicated concentrations of concanavalin A (ConA), HMWF or LMWF for 24 h. Values are presented as mean ± standard deviation (n = 3). Different letters (a–d) indicate significant differences from the CON group at p < 0.05 by Tukey’s post-hoc test.
