B. Western blot analysis of Fam134b isoforms in mock, TFEB S142A:S211A and TFE3 S246A:S312A over-expressing U2OS cells showing induction of FAM134B-2, but not of FAM134B-1 isoform by TFEB/TFE3. Filamin A was used as loading control. Blot is representative of N=3 independent experiments. 