• The feature on gene copy number variations (“Magic numbers”, 8 April, p 38) did not make it clear that such variations are responsible for only the most common form of Charcot-Marie-Tooth Syndrome, called Type 1A, which accounts for roughly half of all cases. Other forms are caused by mutations in genes rather than variation in gene copy number.
• In the feature “Newton’s Curse” (8 April, p 47), chemist Cathrine Reck’s name was misspelled as Catherine.
• Our apologies to Christine Brooks, who sent in the Feedback story about a giant squid at the London Natural History Museum (Feedback, 6 May). We only noticed the email header “Chris Brooks”, and erroneously assumed her to be male.
