Acknowledgmems

We thank S.R.Rodermel for his technical help，and K.M.T.Muskavitch，L.Fish，and E.A.Orr for providing plasmids pZmc 545，pZmc 404，and pZR 4876，respectively.We also thank J.Bedbrook and K.Apel for providing plasmids pSSu 160 and pAB 96，respectively.

Note Added in Proof—UORF 353 has been shown to code for the D-2 protein of PS Ⅱand UORF 473 to be the gene for the 44 kDa Chl protein of the PS(https://www.daowen.com)

Ⅱ reaction center（E.T.Krebbers，K.M.T.Muskavitch，M.Castroveijo，H.Roy，D.R.Russell，L.Bogorad，unpublished data）.