Like DNA, RNA is a complex molecule made of repeating units of thousands of smaller molecules called nucleotides that link together in very specific, patterned ways.
Each probe binds to the RNA of a specific gene-the one that contains a complementary set of chemical units, or bases.
每一个探针与一种特定基因的RNA绑定——它含有了一整套化学物质和基质的集合。
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Frozen brain slabs are kept at cryogenic temperatures until they are further sliced and eventually probed with RNA to look for specific gene expression.