The B-1/B-2 visitor visa is for people traveling to the United States temporarily for business (B-1) or for tourism or medical treatment (B-2). In most cases, the B-1 and B-2 visas are combined and issued as one visa: the B-1/B-2. Fees: $160 application fee, reciprocity fees depending on country of citizenship. Russian nationals can receive single or multiple entry visitor visas valid for the period of up to three years, and pay no reciprocity fee.
FISH testing is usually done on the same samples as a karyotype - blood, amniocytes or a chorionic villi sample. A FISH test is done using a fluorescent probe that binds to certain specific chromosomes. These fluorescent probes are made of DNA specific to certain chromosomes and are tagged with a fluorescent dye.
FISH is a very general technique. The differences between the various FISH techniques are usually due to variations in the sequence and labeling of the probes; and how they are used in combination. Probes are divided into two generic categories: cellular and acellular.