Word: rna
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...four nucleotides that constitute DNA's code letters: A, T, C and G. And visible through arches in each of the tower sides is a central staircase -- spiral, of course. As an added touch, Watson and several of his guests who had investigated DNA's handmaiden, RNA, in the later 1950s wore their RNA Tie Club ties, each bearing the image of the single-strand molecule...
...rose to prominence at the U.S. National Cancer ) Institute, reported last week that a hairpin-shape enzyme derived from a plant virus has shown a remarkable affinity for the virus that causes AIDS. Like the chemical scissors used in gene splicing, the hairpin enzyme hooks onto the virus' RNA and snips it into pieces. Introduced into a test-tube culture of AIDS-infected blood cells, it slowed the spread of the virus...
...frightened by quarks? Do you think that RNA splicing is something done between reels of bad movies starring genetically altered space creatures? Would you rather read your horoscope than an article about a new quasar...
...formidable enough opponent, mainly because researchers still don't understand the method to its madness. Like all viruses, HIV is simply a strand of genetic material (in this case the nucleic acid RNA) surrounded by a protein coat. A virus lacks the tools to reproduce unless it invades a living cell and takes over the host's molecular machinery. The intruder can then produce many copies of itself, eventually killing the cell. One of HIV's favorite targets is the CD4 T-cell, an important player in the human immune system...
Splicing removes the "junk" segments, calledintrons, which are noncoding sequences of RNA...