Abstract: Provided herein are polypeptides comprising a therapeutic targeted for delivery to an organ or tissue, and uses thereof.

Abstract: A bone regeneration material has a cotton-wool like structure formed of a plurality of electrospun fibers that contain bound BMP-2 through ?-TCP binding peptide. The electrospun biodegradable fiber contains 25-65 vol % of ?-TCP particles distributed in the fiber such that a portion of the ?-TCP particles is exposed on a surface of the electrospun fiber and the remaining portion of the ?-TCP particles is buried in the fiber. ?-TCP binding peptides that are fused with BMP-2 are bound to the ?-TCP particles so that BMP-2 is tethered to ?-TCP particles on the surface of the fibers. Upon implantation of the bone regeneration material in a bone defect site of a human body, BMP-2 that are tethered to ?-TCP particles on the surface of the bone regeneration material promotes proliferation and differentiation of cells at the bone defect site.

Abstract: Provided herein are polypeptides that include one or more ?-tricalcium phosphate (?TCP)-binding sequence(s) and uses thereof.

Abstract: Provided herein are beta-TCP binding sequences and chimeric polypeptides that include one or more beta-TCP binding sequences and a mammalian growth factor, compositions comprising any of these chimeric polypeptides (and optionally, beta-TCP), and methods of promoting bone or cartilage formulation, methods of replacing and/or repairing bone or cartilage, and methods of treating a bone fraction or bone loss that include administration of any of these compositions.