| Feature | 5th Edition (Broken PDF) | 6th Edition (2021) | | :--- | :--- | :--- | | | Outdated (pre-CRISPR) | Updated with genetic clock mechanisms | | Optogenetics | Mentioned briefly | Full chapter with applications | | Neuroimmunology | One paragraph | Entire section on microglia role in disease | | Index | Often missing 30 pages | Fully linked and functional |
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