These cells began to devise, then developed into aloin cells through enlargement of volume and vacuolization with the differentiation of metaphloem and metaxylem.

在后生韧皮部和木质部发育成熟过，些细胞积逐渐，液泡化，发育成为型薄壁细胞（芦荟素细胞），位于筛管外侧。