Part of giant hemoglobin C1, V1 and V2. This worm has three different extracellular Hbs: two dissolved in the vascular blood, V1 (CA. 3,500 kDa) and V2 (CA. 400 kDa), and one in the coelomic fluid, C1 (CA. 400 kDa). V1 consists of four heme-containing, globin chains (B-E) and four linker chains (L1-L4). V2 consists of six globin chains (A-F) and C1 consists of five globin chains (A-E). Belongs to the globin family.