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All regular full - and part-time employees whose position requires that they hold a special certificate and who are employed in a professional capacity to work with students and teachers , are classified as certificated personnel . The receptors are made by randomly recombining elements from different libraries , resulting in an exponential number of possible combinations , and hence a huge diversity of receptor structures ( see figure 3 ) . Because detection is carried out by binding with nonself , the immune system must have a sufficient diversity of lymphocyte receptors to ensure that at least some lymphocytes can bind to any given pathogen . If a former bargaining unit employee ( or non-represented employee whose employment is primarily governed by a collective bargaining agreement ) returns to work in a similar capacity in the same employee group ( e.g ., teacher returns as teacher ) , reinstatement of sick leave will be administered per the appropriate collective bargaining agreement . Generating sufficient diversity is a problem because the human body only makes on the order of 106 different proteins , which the immune system must use to construct receptors that can recognize potentially 1016 different proteins or patterns . Come all the way up the hill to the stop sign where Sierra Pinon ends . However , if a principal who has already served as a summer school principal re-applies for a position , he / she will be placed at the bottom of the list , by seniority with other principals who have previously served , enabling all principals to serve in this capacity at least one time prior to a principal being able to repeat assignments . As you come down the hill into Santa Fe , take exit on left towards the plaza . " Experience working cross-culturally and / or commitment to work toward improving one ’ s own cultural competence , i.e ., valuing difference / diversity , recognizing personal limitations in one ’ s skills and expertise , and having the desire to learn in these areas . The department or division with a vacant administrative position will , with the help of the Human Resources Department , determine the timeline for filling the vacancy and outline of Position Description and the Required and Desired Specifications . If a former administrator returns to work in a similar capacity , sick leave reinstatement and / or earnings will be administered per sections 2.08 ( returning after resignation ) or 2.03 ( k ) ( 2 ) ( returning after retirement ) of this Policy and Procedures Manual . Generally , employees surplused or laid off are the least senior employees within the same position title , certification , instructional level , grade level and / or subject area within a given department , division or school . To cover the space of all possible nonself patterns adequately requires a huge diversity of lymphocyte receptors , with relatively low affinity thresholds .