Fig. 4. The groups of ilio-marsupialis muscle samples taken from the animals used in this study are shown in relation to the schematic appearance of the pouch in both non-suckling adults and in females suckling young, together with events during the suckling period. Arrows indicate the ages of the young in the samples taken from lactating females. 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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