Symmetric subgenomes and balanced homoeolog expression stabilize the establishment of allopolyploidy in cyprinid fish. - Ren, Li; Gao, Xin; Cui, Jialin; Zhang, Chun; Dai, He; Luo, Mengxue; He, Shaofang; Qin, Qinbo; Luo, Kaikun; Tao, Min; Xiao, Jun; Wang, Jing; et al. (BMC Biology, 2022)