melatonin antibody?

[Krister Eriksson BIO]

Hello,

Does anybody know if there is an antiserum/monoclonal 
against melatonin?

It seems to me that this molecule, lacking an free amino-
group, would be difficult to conjugate to a carrier protein
for immunization purposes. It would probably also be poorly 
fixed in the tissue, at least with the crosslinking agents
I can think of, namely aldehydes and carbodiimide.

I would very much appreciate any information/comments regarding 
this.

Regards,
Krister

Krister Eriksson
Dept. Biol. ]A Univ.
Turku, Finland