Fig. 4. Antibody assay results for different groups of mice after incubating the TT samples with different formulations at (A) 4℃, (B) 37℃, (C) 50℃ for 3 weeks, and (D) antibody comparison. IgG, immunoglobulin G; TT, tetanus toxoid; TMC, tri-methyl chitosan. **p<0.01 and ***p<0.001 revealed statistically significant.
