1. 
   GF-1
   See erythroid transcription factor.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   GFZ-1
   (GeoForschungsZentrum) A passive geodetic satellite consisting of a 21-cm-sphere covered by 60 retroreflectors; it was designed to study changes in Earth`s rotational characteristics and variations in its gravitational field. GFZ-1 was the lowest-flying geodynamic satellite...
   Found op http://www.daviddarling.info/encyclopedia/G/GFZ-1.html
   
   

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