PKD1 and Complex Cyst of Kidney: Our comprehensive atlas of Pkd1 heterozygous and Pkd1 homozygous mouse kidneys offers a powerful resource for investigating the molecular underpinnings of cell-fate decisions during a key period (postnatal day 7 to day 21) of Pkd1 heterozygous kidney development and Pkd1 homozygous knockout kidney cyst progression.