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Fig. 5. The relative proportions of fast-twitch, composite and slow-twitch muscle
fibres in populations of fibres (fT) dissected from
muscles associated with the nipples in each of the five groups studied. Group
1, nipples never suckled; Group 2, nipples suckled for 36-39 days; Group 3,
nipples suckled for 51-53 days; Group 4, nipples suckled for 68-70 days; Group
5, unsuckled nipples in the pouch of females with young on other nipples.
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