Most histological studies are carried out on paraformaldehyde-fixed, paraffin-embedded tissue samples. Therefore, there is an extensive atlas of most tissues and organs prepared from these sources, and comparing the location of antigens to these data is immediately informative. The fixation and embedding procedures are harsh, however, and many antigens are not well preserved. - [Read Preparing Paraffin Tissue Sections for Immunostaining Protocol]
The multiprotein-DNA complex of interest is formed using the site-specifically derivatized DNA fragment. The complex is then UV-irradiated, initiating covalent cross-linking with proteins in direct physical proximity to the cross-linking agent. Extensive nuclease digestion is performed to eliminate uncross-linked DNA and convert cross-linked DNA to a cross-linked, radiolabeled nucleotide "tag." - [Read Site-Specific Protein-DNA Photo-Cross-Linking: Analysis of Structural Organization of Protein-DNA]
Protocol describes a procedure for uterine transfer, which is used for chimera production. The method is based on extensive work which resulted in the first successful development and birth of in-vitro-cultured mouse embryos. It is best to practice this procedure first on a cadaver and then on an anesthetized 2.5-days post coitum (dpc) pseudopregnant mouse using blue Affigel beads rather than embryos. - [Read Uterine Transfer Protocol]