METHOD OF IDENTIFYING VARIANT CELLS AND A MUTAGENICITY ASSAY PERFORMED BY SAID METHOD

摘要

A toothbrush, comprising a head, its top surface provided with exterior rows of bristles and an intermediate slot, leading into a hollow space in the head; a member having its lower portion accommodated in the hollow head space, its upper portion projecting through the slotted head surface and crested by a single row of bristles; a handle extending from the head having a longitudinal groove extending into the hollow head space; a pusher, disposed movably in the groove, which, when pushed forwardly into the hollow head space or retracted therefrom is capable of raising, respectively releasing the member and its row of bristles.