In the last few years, an increased attention to class II isoforms of phosphoinositide 3-kinase (PI3K) has emerged, mainly fuelled by evidence suggesting a distinct non-redundant role for these enzymes compared with other PI3Ks. Despite this renewed interest, many questions remain on the specific functions regulated by these isoforms and their mechanism of activation and action. In the present review, we discuss results from recent studies that have provided some answers to these questions.

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