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The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins, and kininogens. This gene encodes a stefin that functions as a cysteine protease inhibitor, forming tight complexes with papain and the cathepsins B, H, and L. The protein is one of the precursor proteins of cornified cell envelope in keratinocytes and plays a role in epidermal development and maintenance. Stefins have been proposed as prognostic and diagnostic tools for cancer. [provided by RefSeq, Jul 2008]
[中文简述(自动翻译):]  半胱氨酸蛋白酶抑制剂家族包括含有多种蛋白酶抑制剂类序列的蛋白质。一些成员是活性半胱氨酸蛋白酶抑制剂,而另一些人已经失去或也许从未获得这种抑制活性。有三个抑制家庭的家族,包括1型半胱氨酸蛋白酶抑制剂(stefins),2型半胱氨酸蛋白酶抑制剂和激肽原。该基因编码一个胱抑蛋白,其功能作为半胱氨酸蛋白酶抑制剂,形成用木瓜蛋白酶和组织蛋白酶B,H,和L蛋白是角质细胞包膜的角质形成细胞中的前体蛋白中的一个紧配合,并在表皮发展中起着一定的作用,并保养。 Stefins已被提议作为用于癌症预后和诊断工具。 [由RefSeq的,2008年7月提供]
CSTA基因(以及对应的蛋白质)的细胞分布位置:
CSTA基因的本体(GO)信息:
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Exfoliative Ichthyosis, Autosomal Recessive, Ichthyosis Bullosa of Siemens-like | 0.24 | 0 | 4 | CLINVAR_ORPHANET |
| Neoplasm Metastasis | 0.123267234 | 3 | 0 | BeFree_CTD_human_LHGDN |
| Nasopharyngeal carcinoma | 0.120271442 | 1 | 0 | BeFree_CTD_human |
| Glioblastoma | 0.12 | 1 | 0 | CTD_human |
| Disease Progression | 0.12 | 2 | 0 | CTD_human |
| Psoriasis | 0.005905708 | 3 | 0 | BeFree_GAD_LHGDN |
| Dermatitis, Atopic | 0.002995792 | 1 | 0 | BeFree_LHGDN |
| Mammary Neoplasms | 0.00272435 | 1 | 0 | LHGDN |
| Malignant neoplasm of prostate | 0.001085767 | 4 | 1 | BeFree |
| Prostate carcinoma | 0.001085767 | 4 | 1 | BeFree |
| Malignant neoplasm of breast | 0.000542884 | 2 | 0 | BeFree |
| Diabetes Mellitus | 0.000542884 | 2 | 0 | BeFree |
| Ichthyoses | 0.000542884 | 2 | 0 | BeFree |
| Congenital ichthyosis | 0.000542884 | 2 | 0 | BeFree |
| Tumor Progression | 0.000542884 | 2 | 0 | BeFree |
| Breast Carcinoma | 0.000542884 | 2 | 0 | BeFree |
| Adenocarcinoma | 0.000271442 | 1 | 0 | BeFree |
| Asthma | 0.000271442 | 1 | 0 | BeFree |
| Brain Neoplasms | 0.000271442 | 1 | 0 | BeFree |
| Non-Small Cell Lung Carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Squamous cell carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Diabetes | 0.000271442 | 1 | 0 | BeFree |
| Eczema | 0.000271442 | 1 | 0 | BeFree |
| Glaucoma | 0.000271442 | 1 | 0 | BeFree |
| Chronic Obstructive Airway Disease | 0.000271442 | 1 | 0 | BeFree |
| melanoma | 0.000271442 | 1 | 0 | BeFree |
| Varicose Ulcer | 0.000271442 | 1 | 0 | BeFree |
| Secondary malignant neoplasm of lung | 0.000271442 | 1 | 0 | BeFree |
| Secondary malignant neoplasm of bone | 0.000271442 | 1 | 0 | BeFree |
| Malignant neoplasm of lung | 0.000271442 | 1 | 0 | BeFree |
| Squamous cell carcinoma of esophagus | 0.000271442 | 1 | 0 | BeFree |
| Carcinoma of lung | 0.000271442 | 1 | 0 | BeFree |
| Invasive breast carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Invasive Ductal Breast Carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Squamous cell carcinoma of the head and neck | 0.000271442 | 1 | 0 | BeFree |
| High Grade Intraepithelial Neoplasia | 0.000271442 | 1 | 0 | BeFree |
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