ARK2 (Arabidopsis Receptor Kinase 2); kinase. similar to S-locus protein kinase, putative [Arabidopsis thaliana] (TAIR:AT4G21370.1); similar to ARK1 (A. THALIANA RECEPTOR KINASE I), kinase [Arabidopsis thaliana] (TAIR:AT1G65790.1); similar to ARK3 (Arabidopsis Receptor Kinase 3), kinase [Arabidopsis thaliana] (TAIR:AT4G21380.1); similar to receptor kinase 1 [Brassica rapa] (GB:BAA23676.1); similar to SFR3 [Brassica oleracea var. acephala] (GB:CAA74662.1); similar to SFR1 [Brassica oleracea var. acephala] (GB:CAA74661.1); contains InterPro domain Apple-like (InterPro:IPR003609); contains InterPro domain Serine/threonine protein kinase; (InterP