Buying 'Regenerative dentistry ... approaches' in Russian was a mistake. The translators might not know that expression of the major histocompatibility complex is something related to cytology, but not to expression as in... emotion. I would have better found an original hardcover book instead. But at least, I still understand the main idea of what's going on in this book.
Another thing, I was very disappointed about, is that the translators are usual teachers from the Dental Surgery introduction department. Screw this