
Active fibroblast
Active fibroblasts are resident cells found in connective tissues. Their nuclei are euchromatic and elongated. This toluidine blue stain of loose connective tissue beneath an epithelium demonstrates the pale-staining collagen fibers and heavily stained elastic fibers. Blood vessels are also visible. 1000x

Fibroblast nuclei
Active fibroblasts are resident cells found in connective tissues. Their nuclei are euchromatic and elongated. This toluidine blue stain of loose connective tissue beneath an epithelium demonstrates the pale-staining collagen fibers and heavily stained elastic fibers. Blood vessels are also visible. 1000x

Elastic fibers
Active fibroblasts are resident cells found in connective tissues. Their nuclei are euchromatic and elongated. This toluidine blue stain of loose connective tissue beneath an epithelium demonstrates the pale-staining collagen fibers and heavily stained elastic fibers. Blood vessels are also visible. 1000x

Collagen fibers
Active fibroblasts are resident cells found in connective tissues. Their nuclei are euchromatic and elongated. This toluidine blue stain of loose connective tissue beneath an epithelium demonstrates the pale-staining collagen fibers and heavily stained elastic fibers. Blood vessels are also visible. 1000x

Epithelium
Active fibroblasts are resident cells found in connective tissues. Their nuclei are euchromatic and elongated. This toluidine blue stain of loose connective tissue beneath an epithelium demonstrates the pale-staining collagen fibers and heavily stained elastic fibers. Blood vessels are also visible. 1000x

Mast cell
Active fibroblasts are resident cells found in connective tissues. Their nuclei are euchromatic and elongated. This toluidine blue stain of loose connective tissue beneath an epithelium demonstrates the pale-staining collagen fibers and heavily stained elastic fibers. Blood vessels are also visible. 1000x

Blood vessels
Active fibroblasts are resident cells found in connective tissues. Their nuclei are euchromatic and elongated. This toluidine blue stain of loose connective tissue beneath an epithelium demonstrates the pale-staining collagen fibers and heavily stained elastic fibers. Blood vessels are also visible. 1000x