the phytochrome preparations having sar ( specific absorbance ratio , a668/a280 for the pr form as a measure of phytochrome purity ) values of greater than 0.95 were homogeneous on sds gel , but could be further purified to a sar value of 1.07 by repeated gel filtrations on a bio-gel a-0.5 m column .
C0031857
phytochrome
C0250581
a