Click Change next to your profile name. On the next screen, you should see a list of the Mojang games registered to your account. Find the Minecraft row in this list, then find your username to the right. Click Change next to your username to proceed.
One of the most famous examples of parallel structure use might be Abraham Lincoln's You can fool all of the people some of the time, and some of the people all the time, but you cannot fool all the people all the time.. Many great speech makers and politicians used parallel structure in their speeches, including Martin Luther King Jr.
Secondary structure. Definition. noun. A structure of a biological molecule characterized by the local folding within the biopolymer as a result of hydrogen bonding (within the biopolymer). Supplement. In proteins, there are four recognized levels of protein structure: primary structure, secondary structure, tertiary structure, and quaternary structure. A secondary structure of a protein pertains to the folding of a polypeptide chain, resulting in an alpha helix, beta sheet or a random coil structure. Another example of a secondary structure is that of a nucleic acid such as the clover leaf structure of tRNA. See also: protein structure.