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"Percentages of cell types (means ± standard deviation) in tibial bone marrow of infants from birth to 18 months of age. Data were obtained from normal American infants of black, white, and Asian racial origin. The changes in the marrow during the first 18 months of postnatal life are based on differential counts of 1000 cells classified on stained smears on each of 10 serial marrow samples aspirated from the same population of infants. Criteria for including bone marrow data in this study consisted of the absence of any clinical evidence of disease, normal rate of growth, and normal serum proteins and transferrin saturations.

Populations of Normal Infants0

Month

Populations of Normal Infants0

Month

5 (n

=

22)

6 (n

=

22)

9 (n

=

16)

12 (n =

= 18)

15 (n

=

12)

18 (n

=

19)

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