Changes

Iron is found within each haem component of haemoglobin and binds oxygen.

Iron is found within each haem component of haemoglobin and binds oxygen.

===Folic acid and vitamin B12===

===Folic acid and vitamin B12===

Required for DNA synthesis and thus important for the formation of new erythrocytes. Deficiency leads to the formation of macrocytes.

These elements are required for DNA synthesis and are important for the formation of new erythrocytes. Deficiencies leads to the formation of ''macrocytes''.

==Regulation==

==Regulation==