For glucose estimation in blood, the mode of transpo from a PHC to lab:
Sodium fluoride
EDTA
Citrate
0.9% saline
Zinc finger motiff The specificity involved in the control of transcription requires that regulatory proteins bind with high affinity to the Correct region of DNA. Three unique motifs - The helix-turn-helix - Zinc finger - The leucine zipper accounts for many of this specific protein DNA interactions. So zinc finger motiff helps in binding of regulatory proteins to DNA and not in protein folding.