The characteristic of good a reporter protein is that it should be easy to assay or detect and is not present normally in the test system. Selection of the reporter system also depends on the experimental system, sensitivity needs and the available detection strategy, be it absorbance, fluorescence or bioluminescence.
1 Included among these breeds are the English Toy Terrier and the Yorkshire Terrier. 2  While small, they retain true terrier character and are not submissive  lap dogs 3  . Bull type Terriers: The Bull and Terrier types were originally combinations of bulldogs and terriers as general mixed breed bull-baiting and pit dogs. Toy terriers: Bred down from larger terriers, these terriers are shown in the Toy or Companion group. 2  Included among these breeds are the English Toy Terrier and the Yorkshire Terrier. 3  While small, they retain true terrier character and are not submissive  lap dogs .
The two are now being recognized as separate breeds. Today the American Pit Bull Terrier is being bred with the same gentle qualities as the American Staffordshire Terrier. They both make great pets with the right kind of owner. The American Staffordshire Terrier was recognized by the AKC in 1936. Some of the American Staffordshire Terrierâs talents are watchdog, guarding, police work, weight pulling and agility.