Protoplast from a tobacco leaf cell

Protoplast from a tobacco leaf cell

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Scanning electron micrograph of a protoplast from a tobacco leaf cell, Nicotiana tabacum, showing the regrowth of cellulose microfibrils across the surface of the plasma membrane. A protoplast is a single intact cell, which has been chemically treated to remove the tough outer cellulose wall, leaving only the delicate plasma membrane (seen here), binding the cell together. Protoplast technology has given rise to two types of genetic experimentation; nuclear fusion, where the cyto- plasm & nuclei of two cells are fused, & DNA microinjection, where specific genes are selected from one cell & injected into another. Magnification: X 512 at 35mm, X 4,000 at 10x8-inch size.

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Keywords: botanical science, botany, cell, cells, cellulose, dna microinjection, genetic engineering (plant), nuclear fusion (cell), plant structure, plasma membrane, protoplast, scanning electron micrograph, sem

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