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Stem Cells

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A cluster of red cellular flesh.


Makes a fetus grow on the side of Isaac's head.

Increases available maximum Heart Containers by one and heals one and a half-hearts.

Increases Shot Speed by 16%


  • Stem cells are an undifferentiated cell of a multicellular organism that is capable of giving rise to indefinitely more cells of the same type, thus why another human is growing out of Isaac.

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