(e.g., a specific website, a file on your computer, or a textbook)
In genetic research, researchers have identified 269 rare disease classes . If your interest is in bioinformatics or clinical data, a "guide" in this context would involve using tools like the Rareservoir to analyse genetic variants. 269rar
(e.g., "I need to open this file," "I'm looking for a game walkthrough," or "I'm researching rare diseases.") a specific website