Pdf PDF-associated peptide pdf pigment dispersion factor Pigment-dispersing factor Drm-pdf PDF-precursor PDF-associated peptide cPDH pigment dispersing hormone Pigment-dispersing hormone-like peptide BcDNA:RH08487 pigment dispersing factor PDH Pigment Dispersing Factor PIGMENT DISPERSING FACTOR pigment-dispersing hormone PDF Drm-PDF Drm-PDH CG6496 PDF C7 PIGMENT-DISPERSING FACTOR Pigment dispersing factor PAP pigment-dispersing factor Pigment-Dispersing Factor anon-WO0140519.3 Pigment-dispersing hormone anon-WO0140519.261 gene