Table 4. The contents of α-helix in the BSA-haloemodin system.

Experimental samples	The content of α-helix (%)
1 ìM BSA	67.2
1 ìM BSA + 1 μM HEI1	66.1
1 ìM BSA + 1 μM HEI2	61.9
1 ìM BSA + 1 μM HEI3	64.9

BSA, bovine serum albumin; HEI1, 2-iodioemodin; HEI2, 2,4-diiodoemodin; HEI3, 2,4,5-triiodoemodin.