Rosette (botany) arrangement has been confirmed to improve survival, help water balance, or protect the plant from cold injury are "Espeletia schultzii" and "Espeletia timotensis", both from the Andes. The rosette form is the structure, the relationship of the parts, and the variations within it, as shown in the following study from a herbarium: As form then, "rosette" is used to describe plants that perpetually grow as a rosette and the immature stage of plants such as some ferns. Rosette (botany) In botany, a rosette is a circular arrangement of leaves or of structures resembling leaves. In flowering plants, rosettes usually sit
Calyx of Held embryonic calyx formation. One characteristic that distinguishes Eph proteins and their receptors from other signaling systems is their ability to transmit information bidirectionally. Forward and reverse signaling in VCN and MNTB cells is essential for the proper number and formation of VCN and ipsilateral MNTB projections in the calyx. Eph proteins also ensure that while axons pass through the ipsilateral MNTB, branching and final termination of these projections only occur in the contralateral MNTB, possibly because the proteins are only targeted towards specific regions on the axons. Overall, there are two ultrastructural changes that occur in the calyx of Held.