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Graphs showing the thickness of the ameloblasts and enamel layers in P5 incisors. Note the decrease in height of both lingual and labial ameloblasts in Spry4−/− incisors (B). The antero-posterior extent and thickness of the lingual enamel is similar in both Spry4−/− and Spry2+/−; Spry4−/− incisors. Black arrowhead indicates posterior end of the enamel organ (posterior limit of the labial part of the cervical loop). All measurements made in micrometers.
