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How did Till & McCulloch demonstrate the existence of multi potent stem cells? The experimental findings should be discussed in more detail Immcarle30 (talk) 01:46, 16 January 2017 (UTC) What contributions do Till & McCulloch continue to make in their field? There's not enough detail about what their current contributions are Immcarle30 (talk) 01:55, 16 January 2017 (UTC)