INFORMATION STORED IN HUMAN GENOME. “Instead of describing each cell as a 1.5 Gb parcel, it would be more useful to think of each cell as containing 1.5 Gb of “core” code with much more than 1.5 Gb of data (~35 million histones, each with 8 subunits, and each subunit with likely a thousand unique states) that represents the current active state of the code.”
http://bitesizebio.com/8378/how-much-information-is-stored-in-the-human-genome/