Phylogenetic tree of DCL genes in soybean, sorghum, Arabidopsis, and rice. There are two DCL1 in soybean, sorghum, and rice, while only one in Arabidopsis. There are two DCL2 in soybean and rice, but one in sorghum and Arabidopsis. Soybean, Arabidopsis, and rice have only one DCL3, whereas Sorghum has two. Only soybean has two DCL4 and the other has only one DCL4.