LONDON (AP) — Britain’s Tate Modern art museum on Thursday unveiled one of the most significant gifts it has received in years – a masterpiece by an American abstract expressionist that hung for years on a bedroom wall in Miami.

Joan Mitchell’s painting “Iva†is the centerpiece of a major donation from Florida-based philanthropists Jorge M. Pérez and Darlene Pérez that also will help Tate expand its collection of works by Latin American and African artists.

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