Pregnancy can bring on acne or make existing acne worse. The surge of hormones during pregnancy results in the skin secreting more oils. This oily substance (sebum) combined with dead skin cells can clog pores. The most affected areas seem to be the face, neck, back, chest and shoulders. Stress can make acne breakouts worse, so in addition to using an oil-free cleanser and eating a healthy diet, be sure to take steps to relax and take care of your mental and emotional health.
HLA tests could be done with 80% accuracy, but could not distinguish between close relatives. Genetic parental testing technology advanced further with the isolation of the first restriction enzyme in 1970. Highly accurate DNA parental testing became available in the 1980s with the development of RFLP.
1 1982: The first recombinant DNA vaccine for livestock is developed. 2  1982: The first biotech drug, human insulin produced in genetically modified bacteria, is approved by FDA. 3  Genentech and Eli Lilly developed the product. 4  1985: Genetic markers are found for kidney disease and cystic fibrosis.