theseus1 (the1) is a transmembrane receptor-like kinase (rlk) that is found in plant cells. it was originally discovered in "arabidopsis thaliana" as part of a family of 17 related proteins, commonly referred to as the theseus1/feronia family or the crrlk family. so far, the1 and 5 other members in the same family of rlks have been found to play key roles in cell elongation during vegetative growth through interacting mostly with the cell wall. though the exact mechanism for this process is still unknown, it is thought to be very similar to, and even partially regulated by, the brassinosteroid pathway. in addition, theseus1 has the ability to detect changes in cell wall integrity and could possibly even recognize pathogenic sequences. while the workings of the1 and other members of the crrlk family are understood on a general level, research of the specific interactions between them has yet to be published.