Without the positive selection process in lymphocyte maturation without the positive selection process in lymphocyte maturation autoimmune diseases would be likely to result t-cells would not be able to properly bind to apc's and therefore not be activated by them nk cells would be non-functional monocytes would not be able to migrate into infected tissue and differentiate into macrophages

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.