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Why AbbVie (ABBV) Stock Is Down Today

NEW YORK (TheStreet) -- AbbVie (ABBV) stock is tumbling 4.20% to $59.83 on heavy trading volume early Tuesday afternoon, as one of its patents on its top-selling arthritis drug Humira might be invalid, according to the U.S. Patent and Trademark office.

The agency has agreed to consider a challenge by Coherus BioSciences (CHRS), which is petitioning to make a copy of Humira. Coherus has demonstrated a "reasonable likelihood" that it will win the challenge, according to the Patent Trial and Appeal Board, Bloomberg...