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Ideas lose themselves as quickly as quail, and one must wing them the minute they rise out of the grass, or they are gone.Thomas F. Kennedy
- (mathematics) of vectors, parallel but of opposite direction
- (biochemistry) describing the orientations of the two strands of DNA
- (biochemistry) describing two beta strands comprising a protein's secondary structure that are aligned and hydrogen bonded but the vector describing the amino- and carboxy-terminal ends of each strand are oriented 180° relative to one another.
- parallel of opposite direction
- Swedish: antiparallell
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