By Jan Klein (auth.)
Somewhere I heard a narrative of a bridge and a painter. The bridge used to be huge, immense and was once made all of steel, and the painter's task was once to maintain it from rusting. He might begin at one finish and slowly continue, daily, month via month, towards the opposite finish, portray the bridge. yet no may he end with the portray than the bridge may start to rust back. The rust, too, may commence at one finish and slowly continue towards the opposite finish, systematically destroying the painter's recreation. And so the painter could go back to the place he had began, and start portray back, slowly continuing towards the opposite finish of the bridge, consistently only one step prior to the rust. And if the tale is right, the painter may perhaps nonetheless be portray that bridge-a sleek Sisyphus! throughout the writing of this e-book, the tale of the painter and his bridge stored coming to brain. the sphere the booklet covers has been constructing so swiftly that, just like the painter, I too needed to go back to the place I had all started and struggle the rust of obsolescence. yet not like the painter, I had a time limit to fulfill, which constituted some extent of no go back. And so, sending off this manuscript, i've got no selection yet to observe the end result of my undertaking be overtaken through the rust.
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Additional info for Biology of the Mouse Histocompatibility-2 Complex: Principles of Immunogenetics Applied to a Single System
It must be emphasized that in addition to the interconnections shown in these tables, there were probably many more, of which there is no record. For additional information on the inbred strain genealogy, the reader is referred to articles by Staats (1966, 1972), Heston (1949), and Strong (1942). The Mouse and Its Forms 31 B. Congenic Lines 1. Theory Two lines that are genetically identical (isogenic) except for a difference at a single (differential) locus are referred to as coisogenic. True coisogenicity occurs as a result of a point mutation within an inbred strain; partial coisogenicity can be attained by a series of crosses reconstituting the genetic background of one strain and retaining one gene from a second strain.
When the binding force exceeds a certain threshold, the antigen-receptor interaction triggers a process leading to antibody secretion. The number of B cells capable of immunological response to a given antigen is thus lower than the number of antigen-binding cells, perhaps of the order of 105. The triggered B cells respond by increased DNA synthesis (demonstrable by rapid incorporation of tritiated thymidine), morphological transformation, and proliferation. The small lymphocyte transforms into a blast cell, that is, a large cell (15 to 20ft in diameter) with abundant basophilic (pyroninophilic) cytoplasm and a voluminous nucleus containing loosely arranged chromatin and prominent multiple nucleoli.
Gen. = generation of backcrossing; A = donor strain; BIO = background strain (inbred partner); a = H-2·; b = H-2b. Selection of H-2·JH-2 b heterozygotes is carried out with H-2b anti-H-2· serum. different values of c in the first 12 generations of backcrossing are listed in Table 2-7. 999). For this reason, a strain that has been backcrossed for 12 or more generations is regarded as congenic. 68. Evidently, even after 12 generations of backcrossing, the congenic line still carries a long chromosomal segment derived from the donor strain, in addition to the differentiallocus.