[Biopython] How to rotate the labels in Bio.Graphics.BasicChromosome module in biopython?

[CCWU]

HI,

I try to draw the single chromosome of various lines.

It goes well except the labels of chromosome are too close and then are 
overlapping.

Attached please find the part of result.

I would like to ask is how to rotate the labels 90 degrees?


Thanks a lot

David

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