How Can Researchers Provide a Time Window in Experiments Trying

Multiple Choice

How can researchers provide a time window in experiments trying to link gene expression with a specific time window?

A) Use of promoter for LacZ which encodes B-galactosidase
B) Use of BDNF which then induces release of B-galactosidase
C) Use of doxycycline (DOX) will inhibit the transcription factor iTA
D) Promotion of Arc
E) Use of de-phosphorylated form of FMRP.