The present invention relates to LLG polypeptides, which are polypeptides of the triacylglycerol lipase family, and fragments thereof, antibodies against such polypeptides, nucleic acids encoding such polypeptides, and antisense nucleic acids derived from such nucleic acids. The invention relates also to therapeutic compositions and methods comprising the above. In addition, the invention relates to the preparation of LLG polypeptides using recombinant technology and to the use of LLG polypeptides to screen for agonists and antagonists thereof.