| Hf | Symbol for hafnium. (05 Mar 2000) |
|---|---|
| Hfla protease | <enzyme> Cii protein of phage lambda cleaving enzyme Registry number: EC 3.4.21.- (26 Jun 1999) |
| HFR strain | A strain, or clone, in which a conjugative plasmid (such as an F'), integrated in the bacterial genome, is instrumental in the transfer (along with plasmid DNA) of integrated bacterial DNA in a sequential manner to a suitable recipient. Origin: high freguency of recombination (05 Mar 2000) |