16 



15 



14- 



13- 



lAA 



IAN 



H,0 — 



blue Ehr 



Rf 



Fig. 2. Acidic ether fraction of Chlorella pyrenoidosa. A. Chromatographed in 

 isopropanol-ammonia; extract = 7.5 g. fresh wt. of original material. B. Zone Rf 

 0.2 to 0.7 of 2A treated with N HCl, extracted with ether and rechromatographed 

 in ammoniacal isopropanol. C. Zone Rf 0.8 to 1.0 of 2A eluted and rechromato- 

 graphed in water. D. Zone Rf 0.8 to 1.0 of 2A rechromatographed in water after 

 hioassay. Controls of lAA are as in Figure 1. 



[29] 



