Table 2. Net % inhibition of histamine release (IHR) by prepared human basophils from non-atopic individual sensitized with atopic serum in the presence of purified camel IgG isotypes.

Camel IgG isotype	Source of camel IgG isotype
	Preimmune sera		Postimmune sera
	HR (ng/mL)	% Inhibition of HR*	HR (ng/mL)	% Inhibition of HR
IgG1	9.78	4.99	5.48	60.05
IgG2	9.86	3.96	2.83	93.98
IgG3	9.90	3.45	2.59	97.05

Induced HR in the absence of camel IgG: 10.17 ng/mL; Spontaneous HR: 2.36 ng/mL. Where A1 represents induced HR in absence of camel IgG, A2 represents induced HR in the presence of camel IgG, Sp, spontaneous HR.

^*Net % inhibition of HR was calculated as per the formula: ([A1-Sp]-[A2-Sp])/(A1-Sp).