Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.
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Question: Abstract: Solid-phase enzyme immunoassays, based on monoclonal antibodies reactive with different forms of human placental-type alkaline phosphatases, were applied to their detection in human seminal plasma from fertile and infertile men. The placental-like form of alkaline phosphatase (PLAP-like AP), known to occur in testicular tissue, was found in normal seminal plasma. The incidence of detection and levels of this isoenzyme correlated significantly with the designated fertility status of the donor. Seminal plasma (PLAP-like AP) may reflect germ cell function and/or access of testicular products to the ejaculate.

Answer: Placental-type alkaline phosphatase in human seminal plasma from fertile and infertile men.

Question: Abstract: Gintzler found an abrupt increase in pain thresholds in rats during the last days of gestation. While some data suggest a similar increase in pain thresholds for pregnant women, Goolkasian and Rimer have found, using signal detection procedures, that women are increasingly likely to report stimuli as painful during the last 2 weeks of pregnancy. The present studies were carried out to assess pain and discomfort thresholds in the last weeks of women's pregnancies. In the first study, daily measures of the pressure-induced pain thresholds of 6 women who had spontaneous, vaginal births increased during the last 16 days of pregnancy and exceeded the 300 mm Hg maximum stimulus pressure for the last 9 days of pregnancy. In the second study, the discomfort thresholds of 6 women were measured each day during the last 11 days of pregnancy before spontaneous vaginal births. The discomfort thresholds of the pregnant women were higher than those of 6 non-pregnant women whose discomfort thresholds were also measured each day. Pregnant women's thresholds increased before the onset of labor, while the discomfort thresholds of the non-pregnant women were unchanged during the course of the study. These results extend Gintzler's findings of reduced sensitivity to pain shortly before parturition.

Answer: Pain and discomfort thresholds in late pregnancy.

Question: Abstract: This article reports on the findings of a study of medical care expenditures of persons with acquired immunodeficiency syndrome (AIDS) treated at San Francisco General Hospital in 1984. We found that mean charges per AIDS hospital admission were $9024, mean charges of patients with AIDS who received all their hospital inpatient and outpatient care at San Francisco General Hospital in 1984 ranged from $7026 to $23,425, and mean lifetime inpatient charges of patients with AIDS who died and who had received all their inpatient care at the hospital were $27,571. These latter charges were considerably lower than previously published estimates of lifetime direct medical care costs of patients with AIDS, and the possible reasons for the differences include much lower lifetime use of hospital services and somewhat lower cost per hospital day.

Answer:
Medical care costs of patients with AIDS in San Francisco.