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: Lymphocytes from 18 patients with the Wiskott-Aldrich Syndrome (WAS) were examined by scanning electron microscopy (SEM). Most peripheral blood lymphocytes from normal individuals are covered with slender microvillus projections, but a large proportion of lymphocytes from WAS patients were found to be relatively devoid of microvilli. A lymphocyte morphology scoring system was developed to quantify the density of microvilli: Grade 4 classified those lymphocytes with greater than 75% of the surface covered with microvilli with progressive decrements to grade 1, which were those without microvilli. The mean lymphocyte morphology score of eight normal individuals was 3.62 +/- .22. The mean lymphocyte score of WAS patients was substantially lower (2.89 +/- .27, P less than .001). In addition, WAS lymphocytes often were qualitatively abnormal, with short, blunted microvilli. These morphological criteria were used to diagnose WAS from the cord blood lymphocytes of one "at-risk" patient. Thus, WAS is the first primary immunodeficiency in which morphological abnormalities have been identified that can aid in diagnosis.
Which is the apt title for the abstract? option1: Morphological abnormalities in the lymphocytes of patients with the Wiskott-Aldrich syndrome. option2: Double and triple sequential shocks reduce ventricular defibrillation threshold in dogs with and without myocardial infarction.
[EX A]: Morphological abnormalities in the lymphocytes of patients with the Wiskott-Aldrich syndrome.

[EX Q]: Abstract: Cow snout epidermal cells digested by 0.25% trypsin were separated into three regions of keratinocytes by Percoll density gradient centrifugation. The membrane fluidity of keratinocytes in each region was measured by electron spin resonance using 5-doxyl stearic acid (5-DSA) as a labeling agent. The order parameter(s) showed higher values as the depth of the epidermis decreased: lower region of epidermis, 0.632; upper region, 0.645; and horny cells, 0.680. These data indicated that membrane fluidity of epidermal cells decreased as cells approached the surface.
Which is the apt title for the abstract? option1: Spin labeling study on membrane fluidity of epidermal cell (cow snout epidermis). option2: New hepatitis-B vaccine launched [news]
[EX A]: Spin labeling study on membrane fluidity of epidermal cell (cow snout epidermis).

[EX Q]: Abstract: Normal pacemaking in the mammalian heart is driven by spontaneously active cells located in the sino-atrial (SA) node. The rate of firing of these cells and the modulation of this rate by catecholamines are controlled by if, an inward Na- and K-current that turns on at voltages more negative than -40 mV. The 'pacemaker' current if is also present in other types of cell where its ability to produce and modulate a depolarizing process may be useful. For example, in vertebrate photoreceptors if drives the depolarization that terminates the light-induced hyperpolarization. Currents similar to if are also found in hippocampal neurones and DRG neurones. The present report shows for the first time that the opening of single if-channels of low conductance (1 pS) can be resolved using a modification of the patch-clamp technique on isolated SA-node cells. Modulation of if by adrenaline is shown to be mediated by an increase in the probability of channel opening, whereas the single-channel amplitude remains unchanged.
Which is the apt title for the abstract? option1: Characterization of single pacemaker channels in cardiac sino-atrial node cells. option2: Coarctation of the aorta in children undergoing angioplasty: pretreatment and posttreatment MR imaging.
[EX A]:
Characterization of single pacemaker channels in cardiac sino-atrial node cells.