why do mhc i and mhc ii molecules generally bind different peptides
Major histocompatibility complex Diversity of antigen presentation, mediated by MHC classes I and II, is attained in at least three ways: (1) an organism's MHC repertoire is polygenic (via multiple, interacting genes); (2) MHC expression is codominant (from both sets of inherited alleles); (3) MHC gene variants are highly polymorphic (diversely varying from organism to organism within a species).[3] Major histocompatibility complex and sexual selection has been observed in male mice making mate choices of females with different MHCs and thus demonstrating sexual selection.[4] Also, at least for MHC I presentation, there has been evidence of antigenic peptide splicing which can combine peptides from different proteins, vastly increasing antigen diversity.[5]
Seed Seeds are the product of the ripened ovule, after fertilization by pollen and some growth within the mother plant. The embryo is developed from the zygote and the seed coat from the integuments of the ovule.
Van der Waals equation is the volume of the container occupied by each particle (not the velocity of a particle), and k is the Boltzmann constant. It introduces two new parameters: a', a measure of the average attraction between particles, and b', the volume excluded from v by one particle.
National Pledge (India) 1. Hindi भारत मेरा देश है। सब भारतवासी मेरे भाई-बहन है। मैं अपने देश से प्रेम करता/करती हूं। इसकी समृद्ध एवं विविध संस्कृति पर मुझे गर्व है। मैं सदा इसका सुयोग्य अधिकारी बनने का प्रयत्न करता/करती रहूँगा/रहूँगी। मैं अपने माता-पिता, शिक्षको एवं गुरुजनो का सम्मान करूँगा/करूँगी और प्रत्येक के साथ विनीत रहूँगा/रहूँगी। मैं अपने देश और देशवाशियों के प्रति सत्यनिष्ठा की प्रतिज्ञा करता/करती हूँ। इनके कल्याण एवं समृद्धि में ही मेरा सुख निहित है।