您要查找的是不是：
- It consists of the protoxylem (formed first) and metaxylem. 包括原生木质部（最早形成的）和后生木质部。
- It is found in protoxylem and first metaxylem tracheids and vessels. 可在原生木质部和初始后生木质部的管胞和导管中见到。
- 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程中，这些细胞体积逐渐增大，并液泡化，发育成为大型薄壁细胞（芦荟素细胞），位于筛管外侧。
- deutoxylem 后生木质部
- metaxylemn. [植]后生木质部
- metaxylem initials 后生木质部原始细脂
