Fig. 3.
Durability of fluorescent labelling. (A) Two-photon image of Alexa 514-enamel coated pipette before injections into skin (top) and during 1st injection into skin (XY and XZ planes, middle and bottom panels, respectively). (B) 2-photon image of same pipette after ten injections into skin (top) and during the 10th injection into skin (XY and XZ planes, middle and bottom panels, respectively).