| Popis: |
The in vitro response of peripheral lymphocytes to phytohaemagglutinin was investigated in children less than 2 years old, in children 8-13 years old, and in adults. The mean mitotic index in the very young children was about one-half that of older children or adults. Mitotic counts tended to increase with increasing age during the first two years of life. It is suggested that the weaker lymphocytic response to phytohaemagglutinin may be associated with relative incompetence of the cellular immune mechanism in early life. |
