Acts at an early step in the ethylene signaling pathway. Positively regulates ETR1, leading to the negative regulation of ethylene responses. Interacts with ETR1 through a region corresponding to its ethylene-binding domain. Strongly expressed in 1-4-day-old seedlings in the apical hook, cotyledons, root vascular tissue, root tip and root hairs, with little or no expression in the hypocotyl. In light-grown seedlings, expression could also be seen in the apex and young leaves, and disappeared from the cotyledons by 10 days. In mature plants, expressed in floral buds, the style of mature flowers, stems and the rachis. By ethylene. Enhanced ethylene sensitivity. Sequencing errors. Sequencing errors.