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

[EX Q]: Abstract: A [99mTc]RBC study in a 63-yr-old man showed intrahepatic lesions which initially had less activity than surrounding liver tissue. When viewed 3 hr later, these had "reversed" and the lesions revealed increased uptake of the radiolabeled red cells. Some extrahepatic areas showed the same pattern (these were in the mesentery of the small bowel). The lesions proved to be angiosarcomas. Hence, the behavior of labeled red cells in these angiosarcomas mimicked that in benign hemangiomas.
[EX A]: Hepatic angiosarcoma: mimicking of angioma on three-phase technetium-99m red blood cell scintigraphy.

[EX Q]: 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.
[EX A]: Glucocorticoid-induced messenger ribonucleic acids in rat thymic lymphocytes: rapid primary effects specific for glucocorticoids.

[EX Q]: Abstract: In order to investigate the localization of nuclear T3 receptors in adult rat brain, we have developed a technique for separating neuronal and glial nuclei, and compared nuclear T3 binding in both fractions. Glial and neuronal nuclear populations were prepared by homogenization of the whole brain except the cerebellum, followed by discontinuous density gradient centrifugation in 2.4 and 2.2 M sucrose. For purposes of comparison, liver nuclei were prepared by centrifugation in 2.4 M sucrose. Microscopic examination of the nuclei confirmed the purity of the two nuclear fractions to be above 90% with minimal extranuclear contamination. T3 binding studies were performed on the washed nuclear fractions using saturation analysis techniques. Maximum binding (Bmax) and dissociation constant (Kd) were obtained by nonlinear least-squares regression analysis. After 30 min incubation at 37 C, Bmax in neuronal nuclei was 1203 +/- 118 fmol/mg DNA (mean +/- SE) (n = 6), in comparison with 196 +/- 14 fmol/mg DNA in glial nuclei (n = 7). The corrected value for Bmax in glial nuclei, assuming 8% neuronal nuclear contamination, was 100 fmol/mg DNA. Bmax in liver nuclei was contamination, was 100 fmol/mg DNA. Bmax in liver nuclei was 299 +/- 38 fmol/mg DNA (n = 6). The Kd values were 0.38 +/- 0.04 nM, 0.34 +/- 0.05 nM, and 0.33 +/- 0.04 nM in neuronal, glial, and liver nuclei, respectively. The specificity of T3 binding to the nuclear receptor in both neuronal and glial nuclei was studied in competition studies, and revealed closely similar relative binding affinities (T3 greater than T4 greater than rT3) in both. We conclude that the higher T3 binding capacity of neuronal nuclei may be related to their higher protein synthetic ability, suggesting that T3 may be of importance in a rapid structural turnover in these cells. The effect of T3 on myelination in glial cells may be mediated through the nucleus.
[EX A]:
Triiodothyronine binding in adult rat brain: compartmentation of receptor populations in purified neuronal and glial nuclei.