Specialised cell type Animal or plant cell ... released to help it break through the outer membrane of the egg cell Phloem cell Plant The building block of the transport system for sugars Cells ...

They have no cytoplasm. Their walls contain lignin for strengthening. Type of cell Phloem cell Function They transport sugars, amino acids, other substances both up and down the stem to leaves ...

this maturation involves a change in cell identity from phloem parenchyma to barrier cell types. The study reveals that PLETHORA 5, a transcription factor activated by auxin signalling in the ...

Upon root barrier injury, this maturation involves a change in cell identity from phloem parenchyma to barrier cell types.