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drugs that are used to suppress the immune system to prevent tissue rejection.
the inner most layer of the cortex of roots and some stems of plants.
cells that are formed during secondary growth by the vascular cambium ring just to the inside of...
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....
a very long time span in the Earth's history, covering tens or hundreds of millions of years....