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Hello, I am curious as to exactly what the difference is between the Lennox and Miller modifications of Lysogeny Broth are? Is it just a difference in salt concentration? Also, I saw on Phytotechnology Laboratories' website that they offer an "ADP-Free" version of the Lennox modification. I assume this means "animal-derived-product-free" as that is what I see on the website. However, what is the advantage to using ADP-free LB to regular LB, or when would it be appropriate to use ADP-Free LB as opposed to the normal formulation? If anyone needs any clarification as to what I am looking at/talking about, see here: http://www.phytotechlab.com/Detail.aspx?ID=999 Thanks for your help!