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Phylogenetic relationship of holocentric lineages are schematized. Transitions to holocentricity (M → H) and the absence (black box) or presence (empty box) of CenH3 are indicated. Inferred evolutionary origin of a first ‘potentiating event’ (indicated with a star) together with subsequent recurrent transitions to holocentricity allowing the loss of CenH3 in four insect lineages.
