Based on architectural patterns, rather than cytological ones. They are classified based on pathological and cytological features. Improvement in the cytological techniques permit chromosomal studies. It is impossible to distinguish between follicular adenoma and carcinoma on cytological grounds. Further prognostic information can be provided by AgNOR stain of histological or cytological specimen. Fluid may be sent for biochemical, microbiological, and cytological analysis. Coffee plants bred for resistance succeed because of cytological and biochemical resistance mechanisms. These linkages are established by chiasmata, which are the cytological manifestations of CO recombination. The fluid obtained by BAL is submitted for cytological examination. Due to this, it is often used in cytological research. Conventional cytological examination had not revealed any neoplastic cells. In Sri Lanka, the prevalence of HPV is 15.5% regardless of their cytological abnormalities. Molecular, morphological, embryological, and cytological evidence supports a sister relationship between "Medeola" and "Clintonia". These cytological processes are not well understood at present. In addition, US can guide FNA for cytological confirmation of a thyroid lesion.