Complex sentence: Furthermore, other studies have shown to induce expression of Cas9 with a small molecule, doxycyline or even improve Homology Directed Repair (HDR) by using small molecules or inhibitors of Non-Homologous End Joining (NHEJ) pathway.
Split into simpler sentences: Furthermore, other studies have shown to induce transcription of Cas9 with a small molecule, doxycyline. Small molecules can also be used to improve Homology Directed Repair (HDR), often by inhibiting the Non-Homologous End Joining (NHEJ) pathway.