Snippet from the article:
As girls, they insisted on matching outfits, right down to the ribbons in their blonde pigtails. And as teenagers, identical twins Gwennan and Elin Thomas were inseparable, even going to the same university.
‘We were, and are, best friends,’ says Gwennan. ‘I had a freckle on my forehead as a baby – which disappeared – and that was how our parents told us apart. Looking at some childhood photos, we still argue about who is who.’ Yet, in 2002, a shocking, inexplicable event would mark the sisters apart.
That year, Gwennan, then 25, was diagnosed with alopecia, a condition that causes hair loss. She suffers from the most extreme form, alopecia universalis, and has lost all body hair, including her eyebrows and eyelashes. Ten years on, she can still remember the morning she woke to find clumps of hair on her pillow. ‘I burst into tears,’ she recalls. ‘My hair had been thinning for a while but then it started falling out in clumps pretty much overnight.’
Read the rest — One sister has alopecia and the other has a full head of hair
Identical twins… yet one has alopecia universalis and the other doesn’t. One of the leaders in alopecia research is Dr. Angela Christiano, and the rest of the article talks about how this case is causing her to rethink how this might occur in just one twin. Dr. Christiano said, “There may be something, for example reaction to stress, that causes the gene to express itself in one twin but not in the other.”