| precorneal film | A protective film, 7 to 9 nm thick, consisting of external oily, intermediate watery, and deep mucoprotein layers. Synonym: tear film. (05 Mar 2000) |
|---|---|
| precorrin 6x oxidoreductase | <enzyme> Catalyses NADPH-dependent reduction of precorrin-6x to precorrin-6y; involved in vitamin b12 synthesis in pseudomonas denitrificans Registry number: EC 1.3.1.- Synonym: precorrin-6x oxidase (26 Jun 1999) |
| precorrin-2 methyltransferase | <enzyme> Catalyses the conversion of precorrin-2 to precorrin-3; cobi isolated from e. Coli Registry number: EC 2.1.1.- Synonym: cobi gene product (26 Jun 1999) |
| precorrin-2 O-methyltransferase | <enzyme> From pseudomonas denitrificans; catalyses the c-20 methylation of precorrin-2 to precorrin-3 Registry number: EC 2.1.1.- Synonym: s-adenosyl-l-methionine-precorrin-2 o-methyltransferase (26 Jun 1999) |
| precorrin-3 11-methyltransferase | <enzyme> One of enzymes involved in hydrogenobyrinic acid synthesis; 11 aa amino-terminal sequence given in first source Registry number: EC 2.1.1.- Synonym: cbif gene product (26 Jun 1999) |
| precorrin-3 synthase | <enzyme> One of enzymes involved in hydrogenobyrinic acid synthesis; methylates c-20 of precorrin-2 to form precorrin-3; 10 aa amino-terminal sequence given in first source Registry number: EC 2.1.1.- Synonym: cbil gene product, precorrin-2 20-methyltransferase (26 Jun 1999) |
| precorrin-4 methyltransferase | <enzyme> Catalyses the coversion of precorrin-4 to precorrin-5; cobm isolated from e. Coli Registry number: EC 2.1.1.- Synonym: cobm gene product (26 Jun 1999) |
| precorrin-5 methyltransferase | <enzyme> Catalyses conversion of precorrin-5 to precorrin-6x; cobf isolated from e. Coli; has both deacetylase and methyltransferase activities Registry number: EC 2.1.1.- Synonym: precorrin-5 deacetylase, cobf gene product (26 Jun 1999) |
| precorrin-6 methyltransferase | <enzyme> Catalyses the conversion of precorrin-6y to precorrin-8x; has both methyltransferase and decarboxylase activity; cobl isolated from e. Coli Registry number: EC 2.1.1.- Synonym: precorrin-6 decarboxylase, cobl gene product (26 Jun 1999) |
| precorrin-6 reductase | <enzyme> Catalyses reduction of precorrin-6x to precorrin-6y; cobk isolated from e. Coli Registry number: EC 1.3.- Synonym: cobk gene product (26 Jun 1999) |
| precostal | Anterior to the ribs. Origin: pre-+ L. Costa, rib (05 Mar 2000) |
| precostal anastomosis | Longitudinal anastomosis of intersegmental arteries in the embryo that gives rise to the thyrocervical and costocervical trunk. (05 Mar 2000) |
| precritical | Relating to the phase before a crisis. (05 Mar 2000) |
| precrural | <anatomy> Situated in front of the leg or thigh; as, the precrural glands of the horse. Source: Websters Dictionary (01 Mar 1998) |
| precuneal | Anterior to the cuneus. (05 Mar 2000) |