Substitution of the Lys linker with the ß-Ala linker dramatically decreased the renal uptake of 99mTc-labeled Arg-X-Asp-conjugated and X-Ala-Asp-conjugated a-melanocyte stimulating hormone peptides.
Flook AM, Yang J, Miao Y. Substitution of the Lys linker with the ß-Ala linker dramatically decreased the renal uptake of 99mTc-labeled Arg-X-Asp-conjugated and X-Ala-Asp-conjugated a-melanocyte stimulating hormone peptides. J Med Chem. 2014 Nov 13; 57(21):9010-8.