Santa's Little Helper Duff Beer that has been spilled on the floor. In another board game published by USAopoly called "The Simpsons Monopoly", based on "Monopoly" and released in 2001, the dog is featured as one of the six pewter playing pieces. Santa's Little Helper has also appeared in issues of "Simpsons Comics", in the 2007 film "The Simpsons Movie", and in video games based on "The Simpsons" such as "Night of the Living Treehouse of Horror" and "The Simpsons Game". In addition, the dog has been made into action figures by McFarlane Toys, action figures by Playmates Toys in the World of
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