Tadpoles of Xenopus laevis reared in water containing 0-01% propylthiouracil continue to grow but fail to develop or metamorphose. The haemoglobin of such tadpoles has been extracted in buffer, converted to a cyanmet form, and run on polyacrylamide gels. The developmentally retarded tadpoles are found to possess adult-type haemoglobin rather than the tadpole type which normally characterizes th...

A 36-year-old Caucasian female presented with sore throat, malaise and fever for 5 days. She was febrile and physical examination was remarkable for moderate pharyngeal erythema and mild tonsil hypertrophy. A complete blood count (CBC) showed a white blood cell (WBC) count of 810/ml [87% lymphocytes, 8% variant lymphocytes, 5% monocytes and an absolute neutrophil count (ANC) of zero], hemoglobi...