19809
They 've been able to measure the minuscule movements of the artery wall as the beating heart raises and lowers the pressure of the flowing blood , a first for such tiny blood vessels , they report in Nature , a scientific journal .
 ordinal: first; organization: Nature
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
 Entities: first, Nature 
Answer:
 ordinal: first; organization: Nature