Sample of maternal genetic material (1,1,1)

I believe the answer is:

r n a

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'material' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'sample of maternal genetic' is the wordplay.
'sample of' indicates the answer is hidden within the clue (an extract or sample of the clue).
'R N A' is hidden within 'maternal genetic'.

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