Which of the following statements is not correct?
- AIn oxyhaemoglobin $Fe^{2+}$ is paramagnetic
- BDuring respiration the size of $Fe^{2+}$ increases when it changes from diamagnetic to paramagnetic state.
- CFour heme groups are present in haemoglobin
- DHeme is the prosthetic group and it is non-protein part.
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