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The two different types of units used in the present study
(Upper photo) Sentinels (VC-02-20), which are smaller in size (1.5 cm x 1 cm) and have fewer cells, are explanted and examined periodically to evaluate status of the dose-finding units. For size comparison a US quarter is shown.
(Lower photo) The larger dose-finding units (VC-02-300, 9 cm x 3 cm)) are used to develop the procedures and to assess the safety and efficacy of various quanta of cell doses.
