Fig. 4From: Emerging era of microneedle array for pharmaceutical and biomedical applications: recent advances and toxicological perspectivesTransdermal application of HA-MNs powered with UCNPs@mSiO2 containing mRNA MBs and siRNA for gene monitoring and gene silencing in 3D gels (taken with permission from [79]. Copyright© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)Back to article page