Table 4: The cytotoxicity of VIP in 10−6 mol/L and its antagonist in 10−4 to 10−6 mol/L concentration for 48 h on the growth of NK cells to MKN45 cells.

Groupn OD490

A: MKN45 + NK + VIP + antagonist (1 × 10−4)12
B: MKN45 + NK + VIP + antagonist (1 × 10−5)12
C: MKN45 + NK + VIP + antagonist (1 × 10−6)12
D: MKN45 + antagonist (1 × 10−4)12
E: MKN45 + antagonist (1 × 10−5)12
F: MKN45 + antagonist (1 × 10−6)12
G: MKN45 + NK + VIP12
H: MKN45 + VIP12
I: MKN45 + NK12
J: MKN45 (blank control)12

, . a stands for compared with group J. b stands for compared with group I. c stands for compared with group H. d stands for compared with group G. e stands for compared with group B.