The fractionation of proteins from ox-heart mitochondria labelled in vitro with radioactive amino acids.

heterogeneity of some of the fractions obtained by ethanol fractionation. The conversion of porphobilinogen into por- phyrin has been studied in preparations from various sources, including avian erythrocytes, reticulocytes, Rhodop8eudomona8 8pheroide8, Chlorella and higher plants. The literature has been The primary tetrapyrrole formed is uroporphyrinogen.