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The lipid composition of the concentrated hemagglutininating active fraction (HF) of allantoic fluid from infected eggs, but free from Chlamydia psittaci 6BC, was compared to concentrated normal allantoic fluid (NAF). Phosphatidyl-choline (PC) and phosphatidylethanolamine were the major lipid classes of the total phospholipid fraction. Some quantitative differences were found in the amount of PC and phosphatidylserine present in HF and NAF. Lysophosphatidylcholine was present in HF but absent in NAF. Triglycerides and sterols were the major lipid classes found in neutral lipids of HF and NAF. Quantitative data showed distinct differences in the amount of different neutral lipid classes present between HF and NAF. The fatty acids of various classes of lipids were examined, and differences were noted in a number of phospholipids, sterol esters, and the free fatty acids. Branched-chain saturated fatty acids were found in many lipid classes of the HF, particularly in the phosphatidylethanolamine fraction, but were absent in the NAF.

Lipid Composition of the Hemagglutinating Active Fraction Obtained from Chick Embryos Infected with Chlamydia psittaci 6BC