No, the thyroxine concentration may not always be increased. However, these T4 values are usually at the upper end of the reference range. There are a number of potential reasons for this. Thyroxine levels in the blood naturally fluctuate throughout the day, depending on the metabolic needs of the cat.
The Adventures of Robin Hood is a 1938 American Technicolor swashbuckler film, produced by Hal B. Wallis and Henry Blanke, directed by Michael Curtiz and William Keighley, that stars Errol Flynn, Olivia de Havilland, Basil Rathbone, and Claude Rains.
Thanks to the enormous marketing power of Disney/Pixar's production partner, the film was so successful that it swarmed a sequel, Toy Story 2 which was released in theatres November 24, 1999. Eleven years later, Toy Story received a second sequel, Toy Story 3 which was also released in theatres June 18, 2010.