De-Esterified Homogalacturonan Enrichment of the Cell Wall Region Adjoining the Preprophase Cortical Cytoplasmic Zone in Some Protodermal Cell Types of Three Land Plants

三种陆生植物某些原皮层细胞类型中去酯化的同型半乳糖醛酸在邻近前期皮层细胞质区的细胞壁区域中富集