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- Cano, R.J.; Poinar, H.N.; Pieniazek, N.J.; Acra, A.; Poinar, G.O. Jr.
- Nature 1993 v.363 no.6429 pp. 536-538
- Coleoptera; DNA; polymerase chain reaction; genes; RNA; nucleotide sequences; amber; fossils; Lebanon
- ... DNA has been successfully isolated from both fossilized plant and animal tissues. The oldest material, dated as 25-40 million years old (Tertiary), was obtained from amber-entombed bees and termites. Tissues from both these insects yielded DNA of good quality, which could be amplified by the polymerase chain reaction (PCR) and subsequently sequenced, including the genes encoding 18S ribosomal RNA ...
- Cumberledge, S.; Krasnow, M.A.
- Nature 1993 v.363 no.6429 pp. 549-552
- Drosophila melanogaster; genetic techniques and protocols; gene expression; cell culture
- ... Genetic studies show that intercellular signalling is involved in key steps in Drosophila melanogaster development, but it has not previously been possible to investigate these processes in simplified in vitro systems. Analysis of engrailed (en) and wingless (wg) and other segment polarity genes suggests that two or more intercellular signalling processes may be involved in intrasegmental patterni ...