1 “... of these techniques have only been in practice for a few years and are still being refined and updated. Some are being...”

2 “... of these techniques have only been in practice for a few years and are still being refined and updated. Some are being...”

3 “... presented, discussing their advantages and disadvantages, how they have been used successfully for gene...”

4 “... presented, discussing their advantages and disadvantages, how they have been used successfully for gene...”