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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1951
2
1953
6
1954
7
1955
6
1956
3
1957
4
1958
11
1959
8
1960
7
1961
7
1962
3
1965
1
1966
17
1967
45
1968
53
1969
85
1970
120
1971
173
1972
256
1973
333
1974
422
1975
484
1976
426
1977
406
1978
404
1979
489
1980
508
1981
486
1982
467
1983
516
1984
531
1985
542
1986
464
1987
452
1988
458
1989
483
1990
491
1991
477
1992
493
1993
448
1994
390
1995
417
1996
396
1997
399
1998
391
1999
392
2000
416
2001
470
2002
436
2003
391
2004
410
2005
443
2006
461
2007
430
2008
438
2009
466
2010
415
2011
428
2012
438
2013
413
2014
405
2015
409
2016
337
2017
320
2018
328
2019
325
2020
301
2021
155
2022
26
2023
9
2024
96
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Page 1
Progesterone in human blood and tissues.
ZANDER J.
ZANDER J.
Nature. 1954 Aug 28;174(4426):406-7. doi: 10.1038/174406b0.
Nature. 1954.
PMID: 13194009
No abstract available.
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Progesterone in the blood of the laying hen.
LYTLE IM, LORENZ FW.
LYTLE IM, et al.
Nature. 1958 Dec 13;182(4650):1681. doi: 10.1038/1821681a0.
Nature. 1958.
PMID: 13622621
No abstract available.
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Estrous cycle based on blood progesterone profiles and changes in vulvar appearance of Malayan tapirs (Tapirus indicus).
Kusuda S, Ikoma M, Morikaku K, Koizumi J, Kawaguchi Y, Kobayashi K, Matsui K, Nakamura A, Hashikawa H, Kobayashi K, Ueda M, Kaneko M, Akikawa T, Shibagaki S, Doi O.
Kusuda S, et al.
J Reprod Dev. 2007 Dec;53(6):1283-9. doi: 10.1262/jrd.19100. Epub 2007 Oct 23.
J Reprod Dev. 2007.
PMID: 17965541
Free article.
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