Don't worry. Developing thickened, discolored toenails is a common concern for men and women of all ages. Although there are many reasons that this can happen, it is most often caused by a fungus.
That's right: Repeat Day is a quirky holiday celebrated every year on June 3, giving you an excuse to do things over and over again! Take this opportunity to repeat things you enjoy, such as watching your favorite movie twice or going in for that second piece of cake.
An inverted repeat (or IR) is a sequence of nucleotides followed downstream by its reverse complement. The intervening sequence of nucleotides between the initial sequence and the reverse complement can be any length including zero. When the intervening length is zero, the composite sequence is a palindromic sequence.