I am working in plant sciences and therefore would like to ask what does Het means in assembly of drosophila? Here: ftp://ftp.flybase.net/releases/current/dmel_r5.49/dna/
I know what mean things like Random, U or M, but not this. Is there any place where I could learn all abbreviations used in assemblies? Thank you very much.
(I would say that Het means actually heterochromatin, but why and how would there be such a division?)