Table 1.

The immunization process of BALB/c mice.

Group	Immunization timesa
	First time (μL)	Second time (μL)	Third time (μL)
PBS	100	100	100
pEGFP-C1	100	100	100
pEGFP-C1-ROP19	100	100	100

^a All mice were injected three times at two-week intervals.