it's clear that they went dark. but the website is mentioned in their last Q in 2015; so there is a good reason for them to ignore your email
"Item 2. The address of the issuer’s principal executive offices. 5045 Lorimar Drive Suite 180 Plano, TX, 75093-5707 UNITED STATES OF AMERICA Phone +1-972-381-4699 Fax +1972-381-4635 Website: www.cistera.com IR Contact: Mark Gundy +1-972-240-1873"
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