Which of the following is a correct feature for the free-interface diffusion method of protein crystallization?

Only one layer of precipitant solution

Only one layer of protein solution

The upper layer of a precipitant solution and lower layer of protein solution

The upper layer of protein solution and lower layer of precipitant solution

Which of the following is a correct feature for the free-interface dif

1.	Which of the following is a correct feature for the free-interface diffusion method of protein crystallization?
A.	Only one layer of precipitant solution
B.	Only one layer of protein solution
C.	The upper layer of a precipitant solution and lower layer of protein solution
D.	The upper layer of protein solution and lower layer of precipitant solution
Answer» E.