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: During development, cells become progressively restricted, until they reach their final phenotype. Differentiation was originally thought to be irreversible, but phenotypic plasticity has been observed in a variety of cell types, for example sympathetic neurones, the limb blastema and some glial cell types. A detailed description of the individual steps that lead to expression or reversal of phenotype is essential to understand the molecular events underlying cell differentiation. We examined whether ciliary neurones acquire adrenergic properties when exposed to a permissive embryonic environment. Cholinergic neurones were selectively labelled with a retrogradely transported marker and injected into chick embryos during active neural crest migration. Four to five days after injection, some of the labelled neurones were found in 'adrenergic sites' and had developed catecholamine histofluorescence. The cells had thus accumulated adrenergic neurotransmitters even after differentiation into cholinergic neurones. This result shows that neurotransmitter plasticity occurs in cholinergic neurones and suggests that the neurotransmitter phenotype can be modified by the embryonic environment.
Which is the apt title for the abstract? option1: Cholinergic neurones acquire adrenergic neurotransmitters when transplanted into an embryo. option2: Quantitative CT applications: comparison of current scanners [published erratum appears in Radiology 1987 Sep;164(3):879]
[EX A]: Cholinergic neurones acquire adrenergic neurotransmitters when transplanted into an embryo.

[EX Q]: Abstract: The key determinants of alveolar capillary perfusion are transit times and the extent of recruitment. Capillaries are known to be heavily recruited in the dependent lung, but there are no direct data that bear on how capillary transit times might be affected by gravity. We directly determined mean capillary transit times on the surface of the upper, middle, and lower lung by measuring the passage of fluorescent dye through the capillaries using in vivo television microscopy. In anesthetized dogs, mean capillary transit times averaged 12.3 s in the upper lung, 3.1 s in the midlung, and 1.6 s in the lower lung. This near order of magnitude variation in speed of blood transit establishes that there is a vertical gradient of capillary transit times in the lung. As expected, dependent capillary networks were nearly fully recruited, whereas relatively few capillaries were perfused in the upper lung. The lengthy transit times and sparsely perfused capillary beds in the upper lung combine to provide a substantial part of pulmonary gas exchange reserve.
Which is the apt title for the abstract? option1: Vertical gradient of pulmonary capillary transit times. option2: Female frosh fare fine [letter]
[EX A]: Vertical gradient of pulmonary capillary transit times.

[EX Q]: Abstract: A 16-year-old male presented with a hemopneumothorax following a gunshot wound to the left chest. He was treated effectively with closed suction drainage for 48 hours when he suddenly complained of severe left chest pain. Preoperative diagnosis was suggestive of a traumatic diaphragmatic hernia but operative findings were confirmatory of a rare hernia through the foramen of Bochdalek. Chest X-ray showing a gas-filled viscus above the diaphragm is diagnostic. Increased abdominal pressure generated when he was first hit by the bullet and aggravated by increased negative intrapleural pressure resulting from suction drainage of the hemothorax is the probable mechanism of the herniation.
Which is the apt title for the abstract? option1: Gunshot wound of the left chest and Bochdalek hernia. option2: Spinal deformity.
[EX A]:
Gunshot wound of the left chest and Bochdalek hernia.