Santa's Little Helper and Maggie are—heck, most Americans probably recognize their pets, Santa's Little Helper and Snowball II". McHugh wrote in "Dog" that while Master McGrath was the most famous greyhound of the 19th century, "the most popular greyhound a hundred years later" is Santa's Little Helper. In the television special "50 Greatest TV Animals" that was hosted by Mario Lopez and aired on Animal Planet in 2003, the dog ranked 27th. Other dogs featured on the list were Lassie (first), Eddie (fifth), Snoopy (sixth), Scooby-Doo (13th), Rin Tin Tin (14th), Max (20th), Triumph, the Insult Comic Dog (24th), Buck (29th), Chipper (44th),
Helper dependent virus and capsid encoding DNA, plus helper DNA. Every cell that is successfully transfected with all three DNA fragments will produce the necessary proteins to produce infective viruses. These viruses will only have transgenic DNA encapsidated and therefore once they've infected a patient's cell, they will not be capable of reproducing. Helper dependent viruses can also occur in nature without being "gutted". The term satellite virus has been given to a large group of viruses that all require the presence of another virus to replicate. Many of these are plant viruses, but animal viruses can be seen in the case of