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. 2021 Mar 9;21:106. doi: 10.1186/s12903-021-01467-6

Fig. 1.

Fig. 1

Histologic characteristics of immature premolar teeth. a Histological views of the longitudinal section of teeth (× 1.25 and × 7.5). b Chromogenic stain for STRO-1 in apical papilla. c Hematoxylin and eosin of extracted apical papilla (× 20) n = 5. scale bar 200um