Table 1.

Characteristics of IgG and IgM [12]

Protein	Concentration, mg/ml	MW, kDa	Intravascular, %	Fractional turn-over rate, %/day	Half-life, days
IgG (except IgG3 subclass)	12	150	45	7	22
IgM	0.9	950	78	19	5