Proteins are probably the most versatile of all the organic molecules, making up many structures and executing various functions within organisms. Building blocks called amino acids make up proteins. About 20 different amino acids combine to form all of the various types of proteins on Earth. These amino acids all have almost the exact same composition; the only difference is the R group, which differs in each of the amino acids and gives them their uniqueness.
duration - the period of time during which something continues. continuance. period, period of time, time period - an amount of time; a time period of 30 years; hastened the period of time of his recovery; Picasso's blue period. clocking - the time taken to traverse a measured course; it was a world record clocking.
There are numerous categories of irregular periods, but when it comes to long menstrual cycles, there are two particular issues women could be experiencing: Amenorrhea. A long menstrual cycle could refer to an extended period of time between bouts of bleeding. Amenorrhea is the absence of periods for more than 60 days. It usually occurs during pregnancy and breastfeeding, but it can also occur at other times in a woman's life.