perichromatin fibrils
Structures of variable diameter visible in the nucleoplasm by electron microscopy, mainly observed near the border of condensed chromatin. The fibrils are enriched in RNA, and are believed to be sites of pre-mRNA splicing and polyadenylylation representing the in situ form of nascent transcripts.
GO:0110165
cellular anatomical structure
is_a
GO:0000228
nuclear chromosome
part_of
GO:0000785
chromatin
part_of