NCIt definition : One of three structural motifs observed in DNA binding domains of zinc proteins. Domains
in DNA- and RNA-binding proteins that contain amino acids which are folded into a
single structural unit around a zinc atom that links two cysteines and two histidines.
Each finger is postulated to recognize a specific sequence of about five nucleotide
pairs. Originally identified in the TFIIIA transcription factor, it is also known
as the C2H2 zinc finger.;