Loer and Kenyon, 1993

Table 2. Serotonin-IR neurons in the male tail

Genotype         Alteration of ray pattern*       Pattern of serotonin-IR somata

Wild type        None                             3 present (rays 1, 3, 9)
mab-5            Rays 1-6 missing                 2 anterior somata missing
egl-5            Ray 6 missing                    3 present
lin-22           Additional ray 1-like            3 normal present plus extra
                   structures along body            somata along body
pal-1            Ray 1 displaced anteriorly,      1 soma displaced anteriorly,
                   rays 2-6 missing                 1 posterior soma present

Data are patterns of serotonin-IR somata found in tails of wild-type males and mutant males with altered patterns of sensory rays. The observations are consistent with autonomous expression of a serotonergic phenotype among the remaining ray neurons in these mutants. *References for altered ray patterns are as follows: mab-5 (Kenyon, 1986), egl-5 (Chisholm, 1991), lin-22 (Horvitz et al., 1983, Waring et al., 1992), pal-1 (Waring and Kenyon, 1990).