Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.

Example Input: 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.
Example Output: Animal

Example Input: Abstract: Thirty adult Wistar rats underwent an extradural clip compression injury of 50 g of force for 1 minute at T-1. After injury, the animals were randomly separated into three groups: the control group received a saline infusion for the 2-hour treatment period; the second group was given a blood transfusion over 2 hours titrated to maintain mean systemic arterial pressure (MSAP) at preinjury levels; and the third group received an intravenous bolus dose of naloxone (10 mg/kg), followed by a 2-hour infusion of intravenous naloxone (2 mg/kg/minute). The rats were observed postoperatively for 15 weeks, during which their clinical recovery was measured weekly by the inclined plane technique. At 15 weeks, the spinal cords were removed and prepared for histological assessment. The blood pressure before, during, and immediately after injury did not differ statistically among the three groups. During the initial 2 hours after injury, blood transfusion produced a significant increase in MSAP (P less than 0.02) and hematocrit (P less than 0.001), but naloxone infusion did not result in a significant change in MSAP. Performance on the inclined plane at 15 weeks was 35.6 +/- 6 degrees, 32.7 +/- 4 degrees, and 36.1 +/- 6 degrees for the control, transfusion, and naloxone groups, respectively, and no significant differences were found (P greater than 0.05). Histological examination confirmed a consistent injury of moderate severity in all three groups with no major differences among groups. Thus, this study demonstrates no significant clinical benefit either from a blood transfusion to maintain MSAP or from naloxone given by bolus and infusion after an extradural clip compression injury of the rat spinal cord.(ABSTRACT TRUNCATED AT 250 WORDS)
Example Output: Animal

Example Input: Abstract: California dietitians require skills in working with the large ethnic populations in that state. Cultural foods education needs must be identified and evaluated so that they can be appropriately addressed in the nutrition and dietetics curriculums. Dietitians employed in California hospitals were surveyed to assess their cultural foods knowledge and determine cultural foods education needs. Demographic and opinion data were requested, and knowledge of the food habits of the six largest ethnic groups in the state was tested. California colleges and universities offering ADA Plan IV programs were sent questionnaires regarding the goals, content, and methodology of and the enrollment in cultural foods courses. Results of the dietitian survey (no. = 184; response rate 51%) showed a positive association (p less than .05) between the total score on the cultural foods knowledge test (average score = 62% correct) and completion of a college cultural foods course. Results of the Plan IV program survey (no. = 16; response rate 93%) indicate that 86% of the colleges and universities offer at least one cultural foods course. In 53% of those colleges and universities, Plan IV students are required to take such a course. Course content corresponds well to needs identified in the answers to the dietitian questionnaire. More emphasis on "ethnic food habits" and "disease and food habits" is recommended in the nutrition and dietetics curriculums.
Example Output:
Asian Americans