. 2009 Jul;10(7):512–521. doi: 10.1631/jzus.B0820300

Table 2.

Cellular immune responses of spleen cells from immunized mice

Immunization regimen	Proliferation SI^a	Cytokine production (pg/ml)^b
Immunization regimen	Proliferation SI^a	IL-2	IL-4	IFN-γ
Untreated		<20	<20	<20
Control pcDNA3.1	1.2±0.2	40±11	<20	156±35
pGRA4	4.0±0.3	125±23	<20	1204±60
pGRA4/liposome	9.8±0.8	168±10	<20	1851±84

^{^a}

SI: stimulation index, expressed as the ratio between the mean counts per minute for triplicate stimulated cultures and the mean counts per minute for triplicate unstimulated cultures

^{^b}

The culture supernatants were examined for cytokine production

Values for IL-2, IL-4 are taken from 24 h of culturing, values for IFN-γ from 96 h of culturing