A Simple technic is described by which the cells exuded from a skin abrasion can be collected as a cell suspension suitable for quantitation and for further study of the living cells. The technic is identical in principle to the quantitative modification of Rebuck’s "skin window" technic which was devised by Perillie and Finch, but the smaller flatter chamber is more easily affixed to the arm and rarely leaks and can be left in place overnight without interfering with sleep. Hence, it is more acceptable to the subjects under study and technically more satisfactory. It provides a method of obtaining normal cells and of studying the cellular reaction to various antigenic or nonantigenic stimuli.

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