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added a link to Per Buer's video demo of how dry hopping can affect Lacto (Hop Tolerance section)
''Lactobacilli'' usually don't have these MDT genes 'on', which is why a lot of strains won't do well with hops in the first batch of beer, but over time become more and more tolerant as they increase expression of the MDT's. The overall MDT expression level, in theory, determines the maximum resistance of the bacteria. In the case of my experiments, I'm looking for mutants whose MDT's are permanently stuck 'on' for the resistant strain and 'off' for the sensitive strain <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1143165635711649/?comment_id=1155715074456705&offset=0&total_comments=50&comment_tracking=%7B%22tn%22%3A%22R0%22%7D Conversation 2 with Bryan Heit on Milk The Funk regarding Lactobacillus hop tolerance. 09/28/2015.]</ref>.
See also :* [http://www.garshol.priv.no/blog/337.html How hops prevent infection, by Lars Garshol].* [https://www.youtube.com/watch?v=J2g5P7ZlGn4 Per Buer's Video Demonstration of how Dry Hopping Affects multiple ''Lacto'' species.]
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