So, for example, " blast " forms of erythrocytes, leukocytes, and megakaryocytes start with an N : C ratio of 4 : 1, which decreases as they mature to 2 : 1 or even 1 : 1 ( with exceptions for mature thrombocytes and erythrocytes, which are anuclear cells, and mature lymphocytes, which only decrease to a 3 : 1 ratio and often retain the original 4 : 1 ratio ).
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