Fig. 1

Gene expression patterns of four stomachs during early development. A Principal component analysis (PCA) of 48 samples across four ages and four stomachs based on the gene expression levels. The samples were clustered by tissue (left) and tissue plus age stage (right), respectively. B Heatmap showing the spearman correlation for 48 samples based on the gene expression level. C Bar plot showing the differentially expressed genes (DEGs) between adjacent age groups. D Heatmap showing the relative expression of all DEGs between adjacent age groups, rows (each representing a DEG) and columns (each representing one sample) are unsupervised clustered