An 11-kDa AT-hook motif-containing (AT-HOOK MOTIFS) protein that binds to the minor grove of AT-rich regions of DNA. It is the full-length product of the alternatively-spliced HMGA1 gene and may function as an architectural chromatin binding protein that is involved in transcriptional regulation.

Synonyms: HMG I-Type Protein, 124544-67-8, HMG I Type Protein, HMG I-Y Phosphoprotein, Phosphoprotein, HMG I-Y, HMGI(Y) Gene Product, AT Hook 1a Protein, High Mobility Group, High Mobility Group I(Y) Protein, AT-Hook 1a Protein, High Mobility Group, HMG-I(Y) Protein, HMG I Y Phosphoprotein, HMGA1a Protein, HMGI Protein