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(A) PTHrP in a Dahlgren cell (d) and ependymal cells (e) of the central canal. (B) The same Dahlgren cell also contains urotensin I, detected by specific antiserum to flounder urotensin I. (C) A group of Dahlgren cells showing reaction with antiserum to flounder 1–34 PTHrP. (D) Immunocytochemistry of the same cells using antiserum to flounder urotensin II (UII) showing the presence of UII in the neurones but which is not evenly distributed in all the cells.
