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Expression analysis of AtSUT4 and HvSUT2 in mesophyll protoplasts. RT-PCR products of AtSUT4 (180 bp) and HvSUT2 (270 bp) are visible in mesophyll protoplast preparations (MP). AtSUC2 RT-PCR products (190 bp), a marker gene for companion cell contaminations, are only detected in the typical leaf protoplast mixture (LP). Actin RT-PCR products (100 bp) are indicated by an arrow.
