The researchers created single-cell transcriptomic atlases from 2.56 million cells covering 115 tissues from one fetal piglet and 119 tissues from its pregnant mother.[1] These atlases reveal cell types key to pig pregnancy and fetal growth restriction.[1] The study focuses on familial single-cell maps that allow detailed analysis of cellular composition during pregnancy.[1] The research was published in the journal Science, Volume 391, Issue 6792, March 2026.[1] Atlases provide data on the molecular heterogeneity of cells in various maternal and fetal tissues.[1] Major findings identify critical cell types associated with fetal development and complications such as growth restriction.[1] This work serves as a valuable resource for understanding the physiology of pig pregnancy.[1]