Cis-regulatory variation in the MdCKX6 promoter is associated with allele-specific expression and fruit size in apple - Md Marufur Rahman; Hussain Ahmed; Zhe Zhou; Xiuhua Gao; Yarong Wang; Zhiyong Wu; Chunyan Wang; Zhenli Yan; Qiming Gao; Zhenzhen Liu; Xiangpeng Meng; Yiru Yang; et al. (Plant Science, 2026)