| retrosternal hernia | A diaphragmatic hernia protruding through Morgagni's foramen. (05 Mar 2000) |
|---|---|
| retrosternal space | On lateral chest radiographs, the region dorsal to the sternum and ventral to the ascending aorta. Synonym: anterior clear space. (05 Mar 2000) |
| retrosteroid | A term sometimes used to designate a steroid in which the orientations of the substituents at carbons-9 and -10 are the opposite of those of the reference or "parent" compound. (05 Mar 2000) |
| retrotarsal | Posterior to the tarsus, or edge of the eyelid. (05 Mar 2000) |
| retrotarsal fold | The space formed by the junction of the bulbar and palpebral portions of the conjunctiva, that of the upper lid being the fornix conjunctivae superior and that of the lower lid the fornix conjunctivae inferior. Synonym: fornix conjunctivae, conjunctival cul-de-sac, retrotarsal fold. (05 Mar 2000) |
| retrotransposon | <molecular biology> Transposable element with a transpositional mechanism requiring reverse transcriptase in a manner reminiscent of retroviruses, to which they may be related. (18 Nov 1997) |
| retrotransposons | Transposable elements (transposons) that involve a retrovirus-like process of reverse transcription. The DNA element is transcribed into RNA, reverse-transcribed into DNA, and then inserted at a new site in the genome. (12 Dec 1998) |
| retrouterine | Posterior to the uterus. (05 Mar 2000) |
| retrovaccination | <medicine> The inoculation of a cow with human vaccine virus. Source: Websters Dictionary (01 Mar 1998) |
| retroversioflexion | Combined retroversion and retroflexion of the uterus. (05 Mar 2000) |
| retroversion | 1. A turning backward, as of the uterus. 2. Condition in which the teeth are located in a more posterior position than is normal. Origin: retro-+ L. Verto, pp. Versus, to turn (05 Mar 2000) |
| retroverted | Denoting retroversion. (05 Mar 2000) |
| retroviral vector | <molecular biology> See Retroviridae. Retroviral vectors are used in the genetic modification of cells as a means of introducing foreign DNA into the genome. For example: retroviral vector 's encoding histochemical markers (reporter genes) are used in the study of neural cell lineage in vertebrates. Retroviral vector's may contain the bacterial lacZ gene that encodes for the enzyme _ galactosidase. When the retrovirally infected cells divide, they replicate the foreign DNA. Progeny of infected cells will therefore express the protein and can then be detected histochemically. (11 Jan 1998) |
| Retroviridae | <virology> Viruses with a single stranded RNA genome (Class VI). On infecting a cell the virus generates a DNA replica by action of its virally coded reverse transcriptase. Oncovirinae are one of three subclasses of retroviruses, the others being Lentivirinae and Spumavirinae. See: retroviral vector. (18 Nov 1997) |
| retroviridae infections | Virus diseases caused by the retroviridae. (12 Dec 1998) |