collagen fibers 3d of tendon in longitudinal section, fibrous connective tissue, microscopic on transparent png

generative collagen fibers microscopic tissue fibrous longitudinal tendon histology microscopy microscope histological micrograph photomicrograph cell biology health medical human pattern connective epithelium microscopical mitosis closeup science breast anatomy hepatocyte protein mammary gland histopathology portal area body texture research stain education melanophore sinusoid isolated transparent png background background ai