H1B status is initially granted for a maximum period of three years, but it can be extended for up to six years. This six-year maximum remains in effect no matter how many employers the foreign national has over this time period.
Medical Definition of reticulin. : a protein substance similar to collagen that is a constituent of reticular tissue.
Tuberculin is a glycerol extract of the tubercle bacillus. Purified protein derivative (PPD) tuberculin is a precipitate of species-nonspecific molecules obtained from filtrates of sterilized, concentrated cultures. The tuberculin reaction was first described by Robert Koch in 1890.