Pink king crab blood contains leukocytes and the next-most frequent respiratory pigment called hemocyanin.[25]: 488 Arthropod hemocyanin is a definite variation particular to arthropods which is a metalloprotein that makes use of copper atoms that are certain to its structure. Two copper atoms are needed to bind 1 O2 molecule. https://frankx111tmd2.wikimillions.com/user