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: The crossing over in five murine I-region recombinants (Is/Ik) was studied by restriction fragment length polymorphism analysis after Southern blot hybridization by using I-region-specific probes. These recombinants included three recently developed strains, B10.ASR1, B10.ASR11, and B10.ASR12; and two strains B10.S(9R) and B10.HTT derived earlier. Although these recombinants were reciprocal in haplotype orientation to the three recombinants we reported recently, these too crossed over within the same 7 kb stretch of DNA in the E beta gene. This 7 kb stretch of DNA included the 3' half of the first intron, the beta 1 exon, the second intron, and the beta 2 exon. A comparison of the cDNA sequences of the two parental E beta alleles revealed that although the beta 2 exons were identical, there were several nucleotide differences between the two beta 1 exons. This allowed us to determine the parental origin of the beta 1 exon in the recombinants at the level of transcription by using S1 nuclease mapping. Thus we were able to show that in each case the 3' portion of the first intron and the beta 1 exon were upstream from the site of crossover. All eight recombinants involving the k and s haplotypes now can be mapped within a 4.5 kb stretch of DNA, which includes only the beta 1-beta 2 intron and the beta 2 exon of the E beta gene. These findings imply that the I-E molecules expressed in these recombinants will probably have conserved sequences and therefore will exhibit identical I-E-restricted immune responses, despite the fact that crossing over could have occurred at different sites within the beta 1-beta 2 intron.

Output: Molecular mapping of murine I region recombinants. II. Crossing over in the E beta gene is restricted to a 4.5 kb stretch of DNA that excludes the beta 1 exon.

Input: Consider Input: Abstract: A considerable amount of literature has been devoted to compromise of the right ventricle in spontaneous myocardial infarction. Little information is available regarding disproportionate dysfunction of the right ventricle associated with cardiac operation and the recovery period therefrom. Recognition of the problem is of paramount importance, if support measures are to be implemented. A great deal has yet to be learned regarding the appropriate support for the acutely failing right ventricle. Much remains to be accomplished regarding the assessment of right ventricle reserve, defining the role of risk factors, and quantitating the value of measures to optimally protect the right ventricle from injury during the perioperative period. Recognizing that the integrity of the right ventricle can be altered by numerous preoperative, perioperative and postoperative factors will provide an enlightened disposition on the part of the surgical team. Awareness of these considerations in the planning and conduct of surgical procedures should reduce morbidity and mortality from perioperative right ventricular failure. The imposition of new or unexpected morbidity during operation on a relatively unrelated problem represents surgical imperfection. Appropriate effort toward minimizing insult of the right ventricle could result in significantly decreasing the incidence and severity of perioperative right ventricular failure before the impetus of the continuing clinical problem dictates improvement in techniques to more appropriately treat this frequently preventable problem.

Output: Perioperative right heart failure: etiology and pathophysiology.

Input: Consider Input: Abstract: To study patient preferences on physician attire and etiquette, we interviewed 200 patients on the general medical services of teaching hospitals in Boston and San Francisco. Of these 200 patients, 65% believed physicians should wear a white coat, 27% believed physicians should not wear tennis shoes, 52% believed physicians should not wear blue jeans, 37% believed male physicians should wear neckties, and 34% believed female physicians should wear dresses or skirts. Forty percent of patients wanted physicians to address them by first name, but only 10% of patients wanted to address their physicians by first name. A concurrent mailed survey of 74 medical house staff members at the two hospitals revealed wide variability in physicians' attire and in how patients were addressed at each institution. Thus, many house officers had habits that were less formal than a substantial portion of their patients preferred.
Output: Patient and house officer attitudes on physician attire and etiquette.