The color plate section (usually between chapters 8 and 9) is almost always missing in unverified PDFs. This section is vital for recognizing stained tissue slides under a microscope.

Some university libraries add a faint watermark on each page (e.g., "Copia per studio personale"). This does not affect readability and actually confirms the PDF is from a verified institutional scan.

Many students ignore the warnings and download from file-sharing sites like PDF Drive, Library Genesis, or Z-Library. While some of these files are eventually verified by community checks, the risks are substantial.