Pendetide (GYK-DTPA) is a chelating agent.

It consists of pentetic acid (DTPA) linked to the tripeptide glycine (G) – L-tyrosine (Y) – L-lysine (K).

[1] The following monoclonal antibodies are linked to pendetide to chelate a radionuclide, indium-111.

The antibodies selectively bind to certain tumour cells, and the radioactivity is then used for imaging of the tumours.

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