Cohesin cleavage is insufficient for centriole disengagement in Drosophila

distinct from whole mature pollen [11] is consistent with our finding that miRNAs do not appear to act across the vegetative/sperm cell interface. Our data clearly reveal the presence of different and cell-autonomous differences in miRNA activity in the mature pollen grain of Arabidopsis. They further highlight the importance of promoter specificity when using amiRs to target mRNAs in rapidly dividing and differentiating systems, and the caution required when interpreting cell-to-cell transfer data from amiR experiments.