Haemoglobin, molecular model. This molecule transports oxygen around the body in red blood cells. It consists of four globin proteins (amino acid chains; orange, green, blue and pink). Each globin protein is wrapped around a haem group. This model of deoxyhaemoglobin, the molecule in its non-oxygen bound state, was produced as part of a study of the molecule's affinity and differences between various forms of the molecule's T-state (tense form).