(?i)\bsimilar\s+to
(?i)\bprobable\b
(?i)\bputative\b
(?i)\bpredicted\b
(?i)\buncharacterized\b
(?i)\bunknown\b
(?i)\bhypothetical\b
(?i)\bunnamed\b
(?i)\bfragment\b
(?i)\bwhole\s+genome\s+shotgun\s+sequence\b
(?i)\bclone\b