Multicellular trichomes in cucumber provides a model for elucidating cell diff erentiation. In this issue, Zhao et al. (pp. 925–935) studied a spontaneous micro‐trichome (mict) mutant with dense and poorly developed trichomes, and performed map‐based cloning of the Mict gene. Mict encodes a class I homeodomain‐leucine zipper protein and is expressed specifically in trichome cells.
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