Similar results have been found in other studies [17] [18]. Based on these reports we have defined hard-to-heal ulcers in this study as venous leg ulcers with an initial area of 10cm2 or greater and a duration of six months or more.
A gene is a segment of DNA containing the code used to synthesize a protein. A chromosome contains hundreds to thousands of genes. Every human cell contains 23 pairs of chromosomes, for a total of 46 chromosomes. A trait is any gene-determined characteristic and is often determined by more than one gene. Some traits are caused by abnormal genes that are inherited or that are the result of a new mutation.
Here is the way I think about it: before S phase, a typical human cell contains 46 chromosomes. During S phase, all 46 chromosomes are replicated. Because they are identical copies, it is perfectly fine to say that there are now 92 (46 + 46) chromosomes in the cell. However, the term 'chromatid' is used to describe them until cell division is complete. In other words: a chromatid is just what we a call a chromosome during cell division.