Table 1.

Mean numbers of anterior and posterior pigment-dispersing factor (PDF)-expressing medulla neurons (PDFMe). Values are given as arithmetic means ± standard deviation; the numbers after the semicolons are the numbers of evaluated animals

Experimental setup	Large anterior PDFMe	Medium-sized anterior PDFMe	Small anterior PDFMe	Large posterior PDFMe	Small posterior PDFMe
All experiments (n = 25)	4.2 ± 1.6; 25	3.6 ± 1.0; 24	3.9 ± 1.8; 18	1.7 ± 1.7; 22	2.4 ± 1.3; 22
Anti-PDF + anti-FMRFamide (n = 11)	0 ± 0; 11	3.9 ± 0.9; 10	4.4 ± 1.3; 10	0.1 ± 0.3; 9a	1.8 ± 1.5; 9b
Anti-PDF + anti-Asn13 -orcokinin (n = 14)	0 ± 0; 14	4.1 ± 1.1; 10	2.5 ± 0.6; 4c	0 ± 0; 13	0.1 ± 0.3; 13d

^aOne large posterior PDFMe was FMRFamide-immunoreactive (ir) in only one case

^bOne small posterior PDFMe was not FMRFamide-ir in only one case

^cThe small number is attributable to difficulties in evaluation of weakly labeled preparations

^dOne small posterior PDFMe was orcokinin-ir in only one case