instruction:
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).
question:
Abstract: In two typical cases of calcaneal fracture dislocation, the primary fracture, which runs forward and medially from a point behind the sustentaculum tali, is associated with inversion of the hindfoot. The calcaneus splits into a small anteromedial and a larger posterolateral fragment. Rupture of the lateral collateral ligament allows the posterolateral calcaneal fragment to move laterally to lie immediately subjacent to the distal fibula. Closed reduction is impossible. Open reduction of this rare fracture dislocation is essential. A lateral approach to the calcaneus is generally sufficient, but a second medial incision may be required.
Which is the apt title for the abstract? option1: Fracture dislocation of the calcaneus. A report of two cases. option2: Safety and immunogenicity of live attenuated rhesus monkey rotavirus vaccine.
answer:
Fracture dislocation of the calcaneus. A report of two cases.

question:
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]
answer:
Cholinergic neurones acquire adrenergic neurotransmitters when transplanted into an embryo.

question:
Abstract: We reviewed 72 patients with penetrating trauma to the extremities who underwent arteriography for proximity injury only. None of the patients had clinical evidence of vascular trauma. There were 62 males and ten females, with a mean age of 29.9 years. Gunshot wounds were the most common cause of injury (91.7%) and the thigh was the most common site of injury (47.2%). A normal arteriogram was found in 55 of 72 patients (76.4%). The remaining 17 patients (23.6%) had arteriographic abnormalities that did not warrant surgery. Only one patient was explored (1.4%) for spasm of the popliteal artery. No vascular injury was found at surgery. This study suggests that routine arteriography in proximity injury only may be unnecessary and that these patients could safely be admitted to the hospital for a 24-hour period of observation.
Which is the apt title for the abstract? option1: Suspected vascular trauma of the extremities: the role of arteriography in proximity injuries. option2: Torsional deformity.
answer:
Suspected vascular trauma of the extremities: the role of arteriography in proximity injuries.