INS and diabetes mellitus: The observation of increased Na+, K+-ATPase activity in response to Tetraphenylporphinesulfonate (TPPS), 5,10,15,20-Tetrakis (4-sulfonatophenyl) porphyrinato Iron(III) Chloride (FeTPPS) and 5,10,15,20-Tetrakis (4-sulfonatophenyl) porphyrinato Iron(III) nitrosyl Chloride (FeNOTPPS) pre-treatment is interesting since insulin also causes an increase in Na+-K+-ATPase activity in erythrocytes of Diabetics.