{'fraction_non_alphanumeric': 0.012587412587412588, 'fraction_numerical': 0.0, 'mean_word_length': 5.62962962962963, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Specific cell binding using staphylococcal protein A magnetic microspheres.

Protein A, a protein derived from Staphylococcus aureus, was incorporated into the matrix of magnetic albumin microspheres. Because staphylococcal protein A binds most subclasses of immunoglobulin G through their Fc portions, immunoglobulin may be rapidly bound to microspheres without chemical coupling agents or a diamino-heptane spacer group. Microspheres so prepared bind specifically to a given cell type when incubated in vitro with a heterogeneous cell population. The use of these microspheres as a drug carrier capable of cellular specificity as well as their ability to isolate homogeneous cell populations rapidly is discussed.