Comparison of red pigment-concentrating hormones from the eyestalks of the fiddler crab, Uca pugilator, and the prawn, Palaemonetes vulgaris, with synthetic red pigment-concentrating hormone of Pandalus borealis

Abstract

Synthetic Pandalus red pigment-concentrating hormone and extracts of eyestalks from Uca pugilator and Palaemonetes vulgaris were passed through a column of Bio-Gel P-6. In each instance the elution volume of the fraction that provided maximal concentration of the red chromatophoric pigment of Palaemonetes was the same, indicating thereby that these three red pigment-concentrating hormones have either the same or nearly the same molecular size.