Protein FASTA from closely related species

[saxovocal]

Thank you for the wonderful package.

I have plenty of transcriptome data for my species, but I do not have a protein fasta. Is it recommended to use a protein fasta from a closely related species?

I read your paper's section on "De novo gene prediction from expression data and proteins from closely related species" but am unsure whether this meant using both short read data and protein level data, or both.