A new loss-of-function allele 28y reveals a role of ARGONAUTE1 in limiting asymmetric division of stomatal lineage ground cell Cloning and Characterization of ARGONAUTE Genes in Populus Cloning and sequence analysis of AGO1 gene in Panax ginseng Identification and characterization of Argonaute gene family and meiosis-enriched Argonaute during sporogenesis in maize