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 .
These dogs were much larger than the Yorkshire Terrier we know today, and it's thought that they were used primarily to catch rats in the mills. The Clydesdale Terriers were probably crossed with other types of terrier, perhaps the English Black and Tan Toy Terrier and the Skye Terrier.The Waterside Terrier may also have contributed to the development of the Yorkshire Terrier. This was a small dog with a long blue-gray coat.orkshire Terrier. Small in size but big in personality, the Yorkshire Terrier makes a feisty but loving companion. The most popular toy dog breed in the U.S., the Yorkie has won many fans with his devotion to his owners, his elegant looks, and his suitability to apartment living.