KOJAK encodes a cellulose synthase-like protein required for root hair cell morphogenesis in Arabidopsis. by Favery, B, Ryan, E, Foreman, J, Linstead, P, Boudonck, K, Steer, M, Shaw, P, Dolan, L

“…Plants homozygous for kojak (kjk) mutations initiate root hairs that rupture at their tip soon after initiation. …”