 Its biological half-life is 20 days on average, ranging from 16 to 22 days in different individuals.The substance is an IgG1 kappa monoclonal antibody, the two heavy chains consisting of 449 amino acids each, and the two light chains consisting of 220 amino acids each.The protein part has a molar mass of about 146 kDa, and the sugar part of 3 kDa.