MOLECULAR WEIGHT CLASSES OF RESPIRATORY PIGMENT 313 



TABLE IV 



Intracellular Oxygen Carriers 



" Ec = erythrocruorin, Hb = hemoglobin, MHb = myohemoglobin. 



* Actual species investigated may be found in reference 2731, pp. 357, 358, 360. 



^ Mol. wt. inserted where diffusion constantorsedimentation equilibrium was measured. 

 Values given in brackets are those chosen from data on other proteins by Svedberg 

 and Pedersen {2721, p. 362) as estimates of the molecular weight of the oxygen 

 carrier where its sedimentation equilibrium has not yet been measured. 



^ Where a species may contain several components with different sedimentation velocity 

 constants, th^range is that found within the order or genus for each component. 



* Data on the slmV^r sedimenting components of horse and human hemoglobins have 



been obtained by Svedberg and co-workers, but are as yet unpublished, except in 

 reference 2721 . 

 Note: The hemoglobin in the tracheal cells of Gastrophilus larvae has a molecular 

 weight of about 34,000 (9a). 



