What anatomy is labeled with the arrow in this image? 
Definitions:
Calcified Matrix
The hard, bone substance made when calcium salts deposit in the framework produced by osteoblasts.
Fibroblasts
A type of cell that is responsible for making the extracellular matrix and collagen, playing a critical role in wound healing and tissue repair.
Dense Regular
Connective tissue characterized by tightly packed collagen fibers aligned in a parallel arrangement, providing strength in one direction.
Protein Fibers
Long, string-like structures composed of proteins that play various roles in the cell, including providing support, shape, and enabling movement.
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