Santa's Little Helper and Tiger (50th). According to a writer for McClatchy News Service, the rankings were "determined by popularity, name recognition and how long the show lasted." Among fans and critics, Santa's Little Helper has been mostly well received. He ranked seventh in a 2008 poll by "Dog Whisperer"s Cesar Millan that determined the "best-loved television dog of all time." Lassie ranked first in the poll. In addition, he was voted the tenth favorite "Simpsons" character by readers of "Simpsons Comics" in the United Kingdom in 2010. In a list of their top twelve favorite dogs from cartoons, comics, and animation, writers
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