Reference standards used in endocrine axis and receptor signalling research, including growth hormone axis analogues, sequence fragments and melanocortin receptor ligands. Compounds are grouped by the field of study they appear in, not by any effect, and no claim of activity in humans or animals is made or implied anywhere in this category. None of the compounds listed here holds a marketing authorisation from the Medicines and Healthcare products Regulatory Agency. All material is supplied for laboratory research use only and is not for human or veterinary use.