based on the frequency distribution of follicles with different sizes and on the labeling index ( li ) of granulosa cells as a function of follicle size and of time prior to and after hcg stimulation , two groups of tertiary follicles can be distinguished : growing ( 250-900 micron in diameter ) and mature ( greater than 900 micron in diameter ) elements .
C0018207
granulosa cells
C0018120
follicle