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A Highly Conserved Red Pigment-Concentrating Hormone Precursor in the Blue Crab Callinectes Sapidus
A common red pigment-concentrating hormone precursor in the blue crab
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Abstract
A cDNA library from the eyestalk ganglia of the blue crab identified one clone of 644 bp encoding the red pigment-concentrating hormone precursor.
- The clone includes a 25 amino acid signal peptide, the red pigment-concentrating hormone, and a 73 amino acid related peptide.
- High sequence similarity was observed with a clone from the shore crab, reflecting the close evolutionary relationship between the two species.
- Northern blot experiments revealed two different mRNA transcripts hybridizing with a specific RPCH-cDNA probe, suggesting the presence of multiple RPCH isoforms in the blue crab.
- Crustacean RPCH and insect adipokinetic hormones are structurally related, but their precursors show little similarity.
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