| Thermus filiformis nuclease | <enzyme> A non-specific thermostable endonuclease that leaves 5'-phosphoryl products; preferred substrate is single-stranded DNA; can act on double-stranded DNA; mw 55 kD Registry number: EC 3.1.- Synonym: tf nuclease, nuc17 gene product (26 Jun 1999) |
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| U6 nuclease | <enzyme> Responsible for the removal of uridylates (us) specifically from the u6 3' end of the u6 small nuclear RNA Registry number: EC 3.1.13.- (26 Jun 1999) |
| uridine-specific acid nuclease | <enzyme> Chicken liver enzyme hydrolyzes poly(u) and e. Coli RNA Registry number: EC 3.1.- (26 Jun 1999) |
| UV incision nuclease | <enzyme> DNA repair enzymes which nick at thymine dimers or thymine glycols in damaged DNA, later enzymes excise the damaged part Registry number: EC 3.1.- Synonym: incision endonuclease (26 Jun 1999) |