Fig. 3From: Functionalized microneedles for continuous glucose monitoring(Reproduced with permission [89]. Copyright 2015, the Royal Society of Chemistry)a The sampling and measurement process of blood using a hollow MN and paper-based sensor. b The change of color (above) and calibration curves for glucose measurement (below). c A series of optical images of the blood sampling and glucose measurement in a rabbit ear with the integrated hollow MN and the paper-based sensorBack to article page