What is label extender?

Some articles on extender:

Branched DNA Assay
... Next, an "extender" DNA molecule is added ... Each "extender" has two domains, one that hybridizes to the capture DNA molecule and one that "hangs out" in the air ... The purpose of the extender is two-fold ...

Famous quotes containing the word label:

    People who live in the post-totalitarian system know only too well that the question of whether one or several political parties are in power, and how these parties define and label themselves, is of far less importance than the question of whether or not it is possible to live like a human being.
    Václav Havel (b. 1936)