Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.

Input: Consider Input: Abstract: We measured the activity of the enzyme porphobilinogen deaminase in red blood cells of 222 persons. Ninety-seven of 107 patients with acute intermittent porphyria had enzyme activity below the normal range, whereas 55 of 56 patients with other types of porphyria had normal activity. This underscores the utility of this test in confirming the diagnosis of acute intermittent porphyria. Measurement of enzyme activity in 41 families with acute intermittent porphyria demonstrated that deficient activity is inherited as an autosomal dominant trait. Many latent carriers of the genetic defect were identified by family studies, permitting appropriate precautions to avoid potentially lethal porphyric attacks.

Output: Red blood cell porphobilinogen deaminase in the evaluation of acute intermittent porphyria [published erratum appears in JAMA 1987 Mar 13;257(10):1332]

Input: Consider Input: Abstract: We examined the mechanism underlying the rapid (15-120 min) glucocorticoid-mediated increase in the synthesis of proteins envisioned as mediators of the initial steroid effects in thymic lymphocytes. Analysis of about 1500 in vitro translation products on giant two-dimensional gels revealed rapid hormonal influences on only 7 mRNAs, 6 whose translation products have mol wt and pIs identical to those proteins whose synthesis has been found to be increased after the addition of glucocorticoids to thymus cells. The additional mRNA codes for glucocortin, whose induction in thymus as well as other target cells has been reported. mRNA inductions for proteins 1, 2, and 1N are detectable 15-30 min after the addition of dexamethasone to isolated thymus cells and continue to increase until 2 h, whereas the mRNAs for proteins 4 and 5 are not increased until after 1 h. The mRNA for protein 3 is elevated by 1 h, but attempts to quantitate the change at earlier times have failed because this protein focuses poorly. The parallel between these in vitro translation results and the increased synthesis of individual proteins seen in whole cells demonstrates that increased mRNA levels underlie the cellular changes. Other hormones, such as estradiol, testosterone, and T3, at 10(-6) M and deoxycorticosterone at 10(-8) M do not induce these messages. Partial inductions of 1 and 2, but not 1N, are seen with deoxycorticosterone at 10(-6) M, consistent with its classification as a partial glucocorticoid agonist. Cycloheximide does not block the rise in mRNA for the most rapid inductions, 1, 2, and 1N. The results indicate that dexamethasone rapidly and specifically induces 6 thymus cell mRNAs in addition to the one coding for glucocortin. The cycloheximide results suggest that at least 3 of these represent primary steroid hormone responses.

Output: Glucocorticoid-induced messenger ribonucleic acids in rat thymic lymphocytes: rapid primary effects specific for glucocorticoids.

Input: Consider Input: Abstract: Percutaneous absorption of hydrocortisone was studied in 18 children (aged from 6 weeks to 14 1/2 years) with atopic or seborrhoeic dermatitis, by measuring their serum cortisol before and after application of 1% hydrocortisone cream. Endogenous secretion of cortisol was suppressed with dexamethasone. A 24 h absorption test was performed on nine children. In six, percutaneous absorption was detected. The highest serum cortisol level was reached within the first 6 h. A 4 h absorption test was developed on the basis of the 24 h test. This short absorption test was performed on nine children, and in eight of them absorption of hydrocortisone was detected. The rise of serum cortisol ranged from 98 to 2669 nmol/l. The 2 h ACTH test was performed to evaluate the effect of previous treatment with topical glucocorticoids. Suppressed adrenocortical function was found in five of 13 children, and was associated significantly with high post-application serum cortisol levels. This occurred more often in infants with a severe skin disorder than in older children or in those with mild or moderate skin disease.
Output: Effect of percutaneous absorption of hydrocortisone on adrenocortical responsiveness in infants with severe skin disease.