MOD GRF (1-29) is a synthetic peptide analog of growth hormone-releasing hormone (GHRH). It was first developed in the 1980s when studies revealed that the first 29 amino acids of GHRH possessed all of the biological roles associated with the full-length 44 residue protein. The initially designed peptide, known as GRF (1-29), is the shortest segment of GHRH, and appears to possess all the properties of the full-length hormone. A different truncated synthetic form of GHRH known as Sermorelin or GRF 1-29 also has 29 amino acids. Modified GRF (1-29) undergoes alteration to include four substituted amino groups in its chain. The intention behind these amino modifications is to protect the peptide from both oxidation and degradation during manufacture and transport and in vivo. The modification also appears to increase the binding affinity to GHRH receptors. Though GRF happens to be biologically potent like GHRH, the duration of action is restricted due to a short half-life (less than 10 minutes). As a result, researchers have modified it hoping to enhance its half-life with better therapeutic potential. Modified GRF (1-29) is also known as Mod GRF or Tetra-substituted GRF (1-29). The latter name clarifies that the modified peptide differs from GRF (1-29) as a result of changes in four of its amino acids. Modified GRF (1-29) is identical to CJC-1295 without DAC.
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