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Submitted on: 10 June 2013.
Revised on: 26 June 2013.
Accepted on: 14 July 2013.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
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Submitted on: 05 May 2000.
Revised on: 15 May 2000.
Accepted on: 29 May 2000.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
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