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protophloem

原生韧皮部

1、[植]原生韧皮部

...多原型（polyarch）原生韧皮部（protophloem）后生韧皮部（meta-phloem） ...

2、原生韧皮部

...protopectinase 原果胶酶protophloem 原生韧皮部protophyll 原始叶 ...

mature protophloem element成熟的原生韧皮部成分

Protophloem sieve element原生韧皮部筛分子

生物学

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