Abstract
THE intermitotic phase has been divided into three segments: the phase of synthesis of deoxyribonucleic acid (DNA) (S phase), preceded and followed by ‘gaps’ called G 1 and G 2 respectively1. The duration of these phases can be accurately measured by pulse-labelling with tritiated thymidine, followed by serial killing, preparation of autoradiographs, and determination of the fraction of mitoses labelled at various intervals between injection and death2,3. Several kinds of cells have been so studied; the present communication adds to the list the cells of the growing-hair follicle in the mouse.
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