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.
In mathematics, and more specifically in naive set theory, the domain of definition (or simply the domain) of a function is the set of input or argument values for which the function is defined. That is, the function provides an output or value for each member of the domain.ormal definition [edit]. Given a function f: X â Y, the set X is the domain of f; the set Y is the codomain of f. In the expression f (x), x is the argument and f (x) is the value.