phytochrome a in a sentence

1. Phytochrome A or phyA is rapidly degraded in the Pfr form-much more so than the other members of the family.
2. During his postdoctoral training, Jones established that the plant photoreceptor, phytochrome A, is dimeric and he showed a minimal structural unit for photoperception.
3. Phytochrome A and phytochrome B both respond to an increasing proportion of red light to far-red light which occurs when the shoot comes out into the open.
4. It's difficult to find phytochrome a in a sentence.