puzzle
1 It gets a reaction 5 Soporific 10 Sex-birth link 11 Bodily fluid 12 Ecto's opposite 13 Many, at the start 14 Vitro alternative 16 Sex 18 Keratin component 21 Esophagus-duodenum link 23 Respiratory disorder 25 It goes down the tube 26 Sex 27 1,000,000,000,000,000: pref. 31 Type of acid 32 Extinct marine arthropod 33 Type of gland 34 DNA replication enzyme that untwists

1 Brass component 2 Data analysis find 3 Blood oxygenater 4 Nerce-cell interstice 6 Partum preceder 7 Transuranic element 8 Granulosa cell secretion 9 The "c" in "cAMP" 15 Genera, for example 17 Improvement over Lamarckism 19 Active _____ 20 Truffle, for one 22 Well-being 23 It links with thymine 24 25 Across, e.g. 28 Antibody/antigen test 29 I 30 Genes' chromosome positions

Eric Albert Editor's Note: Auburndale, Mass.-based Eric Albert, who constructs The Scientist's crossword puzzles, is one of the few people in the United States who...

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