Scientists discover what makes human embryo attach to uterus. A UCSF-led research team has identified the first molecular step that allows a week-old human embryo to attach to the uterus. The finding is expected to provide a new tool to diagnose and treat infertility and early pregnancy loss, the scientists report. The researchers found convincing evidence that a molecular sticking process stops the embryoâs journey along the uterine wall and starts attaching it to the wallâthe first stage of implantation. Failure of the embryo to implant causes about three-fourths of lost pregnancies.
In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x 2.
A function is a relation in which each element of the domain is paired with EXACTLY one element of the range. In this case, there is one y-coordinate for every x-coordinate. The vertical line test can be used to determine this. Therefore, it is both a relation and a function. 7. A relation is a set of one or more ordered pairs. A function is a relation in which each element of the domain is paired with EXACTLY one element of the range. The Vertical-Line Test: Given the graph of a relation, if a vertical line can be drawn that does not cross the