Anabaena sp. PCC 7120 cyanobacterial phytochrome gene AphA and its truncated mutant aphA (N-25/C-445) were PCR amplified and cloned.

• 通过PCR技术；从蓝藻PCC7120中扩增出细菌光敏色素AphA的基因aphA；进而构建aphA的缺失突变体aphA(N25/C445).