Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).

[EX Q]: Abstract: The T-cell antigen receptor binds antigen in association with a cell surface molecule encoded by the major histocompatibility complex (MHC). MHC restricted recognition of antigen by this receptor leads to the complex pattern of programmed gene expression that characterizes T-cell activation. The eventual understanding of human T-cell function will require the complete elucidation of the structure of the human T-cell antigen receptor. On human T cells, clonally determined, disulphide-linked alpha and beta chains of the receptor are non-covalently and stoichiometrically associated with three additional polypeptides known as the T3 complex. These receptor subunits are glycoproteins of relative molecular mass (Mr) 25,000 (25K) and 20K (gamma and delta) and a non-glycosylated 20K protein (epsilon). Our studies of murine T cells show that the mouse T-cell antigen receptor consists of at least seven distinct polypeptide chains. In addition to clonotypic alpha and beta chains, the murine complex consists of glycoproteins of 26K and 21K and endoglycosaminidase F (endo F)-insensitive polypeptides of 25K, 21K and 16K. The latter, which we have termed zeta (zeta), exists as a homodimer within the complex. The 26K component (gp26) has been shown to be the murine analogue of the human delta chain. Other cross species homologies remain to be established, however none of the described human receptor components appear similar to the murine zeta polypeptide. We report here the use of an antiserum raised against the murine zeta subunit to identify a previously unrecognized component of the human T-cell antigen receptor. This human protein is T-cell specific and biochemically similar to the murine zeta polypeptide.
Which is the apt title for the abstract? option1: A new subunit of the human T-cell antigen receptor complex. option2: Focal fat deposition in axial bone marrow: MR characteristics.
[EX A]: A new subunit of the human T-cell antigen receptor complex.

[EX Q]: Abstract: Coronary angioscopy provides images of intravascular detail with greater than 0.2 mm spatial resolution and excellent contrast resolution. Using endoscopes of 1.25 to 1.8 mm outer diameter, we performed intraoperative angioscopy of the coronary arteries or saphenous vein grafts, or both, in 58 patients. Eighty-one native coronary arteries and 43 vein grafts were examined. A clear viewing field was created by infusion of crystalloid cardioplegic solution through the aortic root during cardiopulmonary bypass. Technical details crucial for obtaining high-quality images were as follows: sufficient coronary perfusion by cardioplegic solution to displace all blood; adequate intraluminal illumination; and high-quality fiberoptic and lens systems. Incomplete studies in approximately 14% of patients were related to failure to achieve these technical details and lack of scope steerability. In 30% of patients, previously unrecognized anatomic details were revealed by angioscopy. These included intimal flaps at the site of vein-to-artery anastomoses, atheromatous plaques with adherent thrombi, and hemorrhagic ulcerated plaques, not recognized on angiography. Although a coronary intimal flap developed proximal to the anastomosis during retrograde examination in two patients, no serious complications occurred as a result of the procedure. We conclude that intraoperative angioscopy is safe, provides novel information that may be clinically relevant, and has future potential for development of the techniques for coronary endarterectomy and intraoperative balloon and laser angioplasty.
Which is the apt title for the abstract? option1: Intraoperative coronary angioscopy. Technique and results in the initial 58 patients. option2: Breast reduction by central pedicle technique [letter]
[EX A]: Intraoperative coronary angioscopy. Technique and results in the initial 58 patients.

[EX Q]: Abstract: The presence of antibodies to muramyl dipeptide (MDP), an adjuvant structure of streptococcal peptidoglycan, was investigated in patients with acute rheumatic fever (ARF). The detection of these antibodies was done by an enzyme-linked immunosorbent assay with a synthetic multivalent MDP conjugate as an antigen. Sera from 33 of 54 children with ARF had detectable levels of antibodies to MDP at the time of diagnosis. Such antibodies could only be detected in sera from two of 52 healthy children and one of 21 children with acute poststreptococcal glomerulonephritis. The specificity of the antibodies to MDP was demonstrated by inhibition, with free MDP, of binding of the sera to the MDP conjugate. The possible use of these antibodies in the diagnosis of ARF and in screening for safe synthetic muramyl peptides in immunization of humans is discussed.
Which is the apt title for the abstract? option1: Detection of antibodies to muramyl dipeptide, the adjuvant moiety of streptococcal cell wall, in patients with rheumatic fever. option2: Relationship between abnormalities of coagulation and fibrinolysis and postoperative intracranial hemorrhage in head injury.
[EX A]:
Detection of antibodies to muramyl dipeptide, the adjuvant moiety of streptococcal cell wall, in patients with rheumatic fever.