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Histological micrographs of bone tissue from rat tibias following application of human parathyroid hormone (1-34) (PTH)-loaded microneedle arrays (MNs) in rats with ovariectomy (OVX)-induced osteoporosis. (a) Naïve, (b) OVX, (c) subcutaneous administration of PTH, and (d) PTH-loaded MNs. Scale bars represent 500 μm.
