Rail-RNA v0.2.4

Feature addition:

• Rail-RNA now automatically unpacks sample FASTQs in TAR archives to accommodate TCGA raw data.

Bug fixes:

• Rail-RNA no longer crashes for paired-end samples if it encounters a non-ATCG character an input sequence. All non-ATCGs are interpreted as Ns.
• Some issues with writing to user-specified scratch directories have been resolved.