Biopieces.open(options[:stream_in], options[:stream_out]) do |input, output|
input.each_record do |record|
- if record.has_key? :SEQ
+ if record[:SEQ]
entry = Seq.new_bp(record)
options[:hardmask] ? entry.mask_seq_hard!(options[:cutoff]) : entry.mask_seq_soft!(options[:cutoff])