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Percentage of hypomorphs that survived past 5 wk (weaning age). A total of 35 breeding rounds occurred over 43 mo. The average survival rate per breeding cycle was 50% (dash line) which is double the previously reported rate of 24.5%. Colony was refreshed when survival declined—specifically after cycles 9, 23, and 32. The average time between refreshing lines was 13.2 mo.
