What makes frog's tongues sticky?

"A Georgia Tech study found that a frog tongue’s stickiness comes from a unique reversible saliva and a super soft tongue to help frogs net their prey. (Alexis Noel & David Hu/Georgia Tech)"

From https://www.washingtonpost.com/news/morning-mix/wp/2017/02/01/scientist-cracks-mystery-of-the-amazing-power-of-the-frogs-tongue-its-called-spit/ from http://www.bluesnews.com/cgi-bin/board.pl?action=viewthread&boardid=1&threadid=178059 ...

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