Fig S1. (a–d) A representative proliferating infantile haemangioma (IH) explant culture. (a) No cells are visible in the Matrigel at the edge of the IH explant culture at day 0. (b) After 2 weeks in culture cellular outgrowths are clearly visible emanating from the IH explant. (c) Following 1 month in culture blast-like cells are visible arising from the cellular outgrowths. (d) After 3 months in culture multiple blast colonies are clearly visible.

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