PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 28698357-2 2017 Here, we show that Arabidopsis (Arabidopsis thaliana) RopGEF1, a guanine nucleotide exchange factor and activator of Rho GTPases of plants (ROPs), is critically involved in polar distribution of auxin influx carrier AUX1 and differential accumulation of efflux carriers PIN7 and PIN2 and is important for embryo and early seedling development when RopGEF1 is prevalently expressed. Guanine Nucleotides 65-83 Transmembrane amino acid transporter family protein Arabidopsis thaliana 216-220