code: def reference_transcripts_for_variant(
          variant,
          transcript_id_whitelist=None,
          only_coding_changes=True):
      
      predicted_effects = predicted_effects_for_variant(
          variant=variant,
          transcript_id_whitelist=transcript_id_whitelist,
          only_coding_changes=only_coding_changes)
      return [effect.transcript for effect in predicted_effects]
docs: For a given variant, find all the transcripts which overlap the
      variant and for which it has a predictable effect on the amino acid
      sequence of the protein.